Swimming Pool Closing and Winterization

      Here are some important things to know about swimming pool closing and winterization for your vinyl liner in ground swimming pool.

  1. Chemicals in your pool should be balanced and the pool should also be clean to promote your easiest spring opening.
  2. Blow off your deck so no debris (twigs, acorns, nuts, leaves etc) are left under your cover to decompose or hurt your cover.
  3. Make sure that your filter drain cap/plug is removed to drain your filter.
  4. Make sure that your front and rear housing plugs on your pump(s) are removed to drain your pump
  5. Any inline or online chlorinator drain plugs should be removed to drain.
  6. Lower your water level below your jets unless you have vinyl oversteps or benches. You don not want them to come unseated. There are valve plugs made for this scenario where water levels shouldn't be lowered.
  7. Blow dry your return lines, skimmer lines, automatic cleaner lines.
  8. Put air pressure through the bottom drain until you see air come out then shut the bottom drain valve off to hold air in the line keeping water below freeze line
  9. Make sure to turn off all breakers so a timer can not turn your pump on, running it dry and burning it up.
  10. Cover pool with a safety rated winter pool cover. We suggest using a safety rated pool cover from our company ( www.Merodynamicpools.com/pool-safety-covers ) or ( www.AtlantaPoolSafetyCovers.com )

Thanks again for your patronage to Merodynamic Pools Inc.

We value your business!

(770) 720-9905

Health Benefits from Swimming in your New Swimming Pool

Health Benefits from Swimming. Are you suffering from a back injury, a knee injury, arthritis or Chronic pain? Did you know that water exercise therapy and swimming are the most widely used rehabilitation programs subscribed by doctors? Many positive results can be obtained by simply exercising in a swimming pool. Some of these health benefits include strength improvement, weight loss, muscle gain, aerobic cardiovascular improvement that reduces the risk of heart disease and good mental health. Health Benefits from Swimming Swimming is the most recommended exercise by doctors because of it's resistance when training in water and it's low impact on joints. There is no pounding or compression on the joints or spine when swimming in comparison to jogging, running, biking or aerobic classes. Swimming will definitely strengthen your muscles. Whether you swim for exercise or you want to try it for rehabilitation, the benefits of swimming are unmatched. At any age or shape swimming or water exercise will improve your lifestyle. Visit this link to learn more about the great health benefits from swimming when experiencing back or chronic pain. Call Merodyamic Pools today for your free in ground swimming installation consultation.

Swimming Pool Safety Tips, Prevent Accidents Drownings

Swimming Pool Safety Tips

  Here are some swimming pool safety tips to help you enjoy your swimming pool area. Having safety procedures in place helps you rest assured that your pool will maintain a safe and fun experience at your home. Having them in place greatly lessens the chance of unfortunate occurrences. I won't sugar coat this. Drownings are the number 1 cause of death nationwide for children 1-4 years old. All of theses recorded deaths are preventable if proper safety precautions were put in place. When you implement proper safety procedures and put preventative measures in place then you and your family will be much safer around your pool. You should make sure that you have proper pool safety equipment available so if the worst might happen then you are prepared. 1.We suggest having a first aid kit by your pool. In your pool house, cabana, bar area or any other area that's quick and easy to access. Your aid kit should include scissors for any hair related or winter cover entanglement mishaps. 2. Always have a flotation device and a pole and safety hook attachment that is hanging close to the pool for easy access. 3. Always have access to a close phone. It's very smart to install one in the pool area in case of an emergency. 4. Make sure that your pool area is fenced in with self latching and lockable gates. Even in rural areas that may not require them. This helps protect, children, pets and intruders when you're not home. 5. Make sure that all children entering your pool can swim. Get them lessons. We can't express the importance of this.Even toddlers can be taught to keep themselves afloat. see video. 6. Learn CPR in case of an accidental drowning, you don't realize how many of us don't know proper CPR. You may save a life. 7. Keep a very close eye on your children when they are in or near a pool or spa. Nothing that you are obligated to do at that time is more important. So set aside swim times and make your self fully available during the swim times. No chore or work is as important as the re-precautions that may come from not making yourself fully available. 8. Teach your children to stay away from any suction lines including your skimmers, bottom drains or deep wall suction line(s) (should have a proper grate cover on.) Prevent any possible entrapment before it happens. 9. Share all of your safety instructions with family, friends and neighbors. Share the location of your first aid kits and point out your rescue equipment. 10. God forbid, but if your child is ever missing then immediately look for them in your pool or spa first. 11. It's very smart to learn some basic life-saving so that you are able to help in a pool related emergency 12. Install door and window alarms on any that are facing your pool or spa. 13. If you own a spa then use a lockable safety cover on your spa. 14. Install pool and gate alarms so you are alerted when your children go near the water or enter the area. We hope that our swimming pool safety tips empower you to obtain decades of fun and safe pool memories. Remember pool accidents are preventable. Swimming Pool safety tips www.merodynamicpools.com For more swimming pool safety tips, please visit the Association of Pool and Spa Professionals. APSP

How to Open an InGround Swimming Pool for the Summer

InGround Swimming Pool Opening Tips

We will describe this procedure and give you pointers in our: inground swimming pool opening tips. 1. Drain all water off of your cover. (small cover pump works good, submersible or even syphon the water) and remove all of the leaves and debris with a leaf net before draining, while draining and after draining the water off of your cover. Make sure all debris is removed so there is no chance of it falling in your pool. For a safety cover just blow the cover and deck off with a leaf blower. 2. Drain and remove the water bags from your cover. Remove the cover (requires 2 people for the cleanest results) while ensuring no remaining water that has been left on the winter cover spills into the pool. 3. Clean the winter cover and water bags. I suggest using an anti mildew cleaner. Let your cover and water bags dry and only when they are dry place them in a clean, dry storage area that is rodent, insect and pest free. 4. Remove all winterization plugs including the Gizzmo from your skimmer(s), plugs from your Return(s) and deep wall suction line(s). If Foam freeze guard is used in the bottom drain line then remove that also. 5. Install your directionals (eyeballs) back in your return line(s) of pool. 6. Reinstall your pressure gauge(s), site glass on your filters multi port valve, drain plugs at the bottom of your filter top of your filter (if applicable), pump (front and rear housing plugs), chlorinator (if applicable) and heater (heat exchanger, inlet plugs, outlet plugs and reinstall the temp sensor (if all applicable). I suggest teflon tape for all plugs. Snug tighten them and don't cross thread them. Reconnect any plumbing valves or quick disconnects that you may have disconnected during the winterization of your pool equipment and lines. Reinstall your backwash line/hose if necessary. 7. If you have a salt system then remove the covers to or plugs to the plumbing lines that lead to the salt cell and reconnect the unions and wire sensor leads to the unit that may have been disconnected. 8. Clean any water line(s) around the inside of your pool and steps. Clean your coping using a pool friendly cleaner. 9. Fill the pool until it reaches the top of the skimmer. Make sure to reinstall the skimmer weir (door/flap) and skimmer basket. Place the pump basket back into the pump. Lubricate all o-rings with aqua-lube (available at any pool store) before placing them back where they go. 10. If you have a cartridge filter then place a new or clean cartridge in your filter. 11. Reinstall pool ladder(s) with escutcheons (cover plates). Make sure that the ladder anchors are tightened for safety. Reinstall your diving board and reconnect all slide water line hardware (if applicable). 13. I always prime my pool pump and perform the start up in the waste position. Once primed, I like to vaccum any algae or debri to waste (shouldn't be much if pool was closed properly). After vacuuming then turn the pump off and then turn the filter valve to the Backwash position after vacuuming is complete and run to make sure water is clear. Then turn your filter valve to the filter position then turn pump back on. 14. Check the equipment and plumbing for any leaks while running and if you find any then make the repairs. 15. Fill your chlorinator with Chlorine tablets or add the recommended amount of salt if you have a salt system. You may also add a shock or algaecide (salt system users, make sure your system is algaecide friendly) treatment and run for 2 days before checking your water chemistry. 17. Balance your pool water as we describe in our pool chemical balance blog below https://merodynamicpools.com/vinyl-pool-liner-care/ Dealers, for bulk chemicals visit: Alps Pools Merodynamic Pools www.merodynamicpools.com 770-720-9905

Swimming Pool Leak Detection? Find Water loss? How To

Do it yourself swimming pool leak detection. First when performing your own swimming pool leak detection you must enable patience. Water loss in your swimming pool can become frustrating, incur costly water bills and swimming pool leak detection by a pool company is quite expensive. So where do you start? Well first you should know that a pool should lose approximately 1" a week to the sun from evaporation. About 1/8" per day. If kids are splashing and swimming all day that is a different story. Water loss can be caused by a faulty liner, a hole in a vinyl liner, gaskets in your pool not sealing, faulty plumbing, pump gaskets, filter gaskets, cracked underground light condo-it, freeze damage and many other scenarios. I always start with the easiest steps. First, where is your water level stopping. If it's right below the skimmer, then that's your culprit. If it's right below the jets then that's your culprit. If it's halfway down the light, then that's the light condo-it (read down below). But don't ever let your water loss when trial & erroring this go below 4" of water in your shallow end. You will lose the liners seed and it will shrink. Many times when I get a call for a leaky pool it is the muti-port valve internal spider gasket on the filter. It becomes compromised over time from chemicals, salt and the elements and starts letting water out through the waste line because it's not sealing the ports correctly. Check your waste line and see if water is trickling out of the waste line. If it's hard plumbed into the ground then check your waste line sight glass. On a vinyl liner pool you should start by evaluating your liners condition. Age, wear, chemical stains, patches are some factors and if you may have drain and cleaned your pool then shrinkage might be the factor contributing to water loss. First and foremost, don't ever drain your vinyl liner pool as the liner will shrink and never seed properly again like it's original fit. Your problem may be that you simply need a new liner. swimming pool leak detection The average life of a liner is 8 years. I personally have seen an individual get 24 years out of a 20 mil. thick liner and I have seen an individual get 3 years out of a 30 mil. thick liner. Diagnostics are much easier with a clean pool. I have seen where a leaf was sucked into a hole in the liner and stopped the water loss. The homeowner was sure that the leak had to be at their present water level and searched for 2 days until calling us. We moved the leaf and shot some dye and it sucked right in the hole. Some things to look for on the liner when looking for a leak is a divot or washed out area. It helps to wear goggles and look closer under water. It's good to shoot little dye (red ortho used in testing pool water works well) or you can purchase a dye test kit from your local pool store. Check your seals including the stair gaskets, light gasket, skimmer gaskets, return/jet gaskets and your bottom drain gaskets. You will see the dye get sucked in instead of floating next to where you inject it. If you rule out the fact that you may need a new liner or don't have a puncture or hole in your newer liner the you need to move on to some home remedy diagnostics. Plug all of your lines. most pool require 1 1/2" threaded plugs to seal the lines. It's reassuring to put a little teflon tape on the threads so you know they will not leak. Wait overnight and see if the level dropped? If not then you know your liner and gaskets are holding water. Next, remove just the skimmer plug(s) and wait overnight once again. Repeat this step with any other lines and you should figure which line is leaking if any? Bare in mind that the return/jets are usually spliced or teed underground so if they leak you won't know which it is without sound testing (professionally done) while the pool is running. If no signs of leaky pipes are found then you now know that the leak is above the water line and it's time to look into a professional pressure test. Call a professional swimming pool leak detection company. If all looks good in your personal diagnostics then check your light condo-it. Behind the light (remove one holder screw to remove light) you will see where the wire goes into the underground condo-it. Water sits in the condo-it so in freezing temps the condo-it can crack underground creating water loss. Embed some two part underwater epoxy (JB water Weld at Home Depot) around the wire deep into the condo-it and it will rule out that scenario. Remember that the smallest physical leak that you spot can create visible water loss over time. What may look like a trickle can cause a huge water loss over time and a hefty water bill. Visit us at www.merodynamicpools.com or call us at 770-720-9905 for any swimming pool leak detection or pool repair related help that you may need. For gunite or concrete swimming pool leak detection or any of your resurfacing needs visit: www.alisonpoolsinc.com or www.oceanbluepoolsllc.com

How to Put Vinyl Pool Liner Back in Track, Vinyl Liner out of Track?

Question: My pool liner has fallen out of my liner track. Easiest way to get my pool liner back in the liner track? How to put vinyl pool liner back in track ? Answer:  Merodynamic Pools gets a lot of calls for the answer to this question. Your pool liners track is made from plastic or aluminum or steel (old School). Plastic track usually becomes compromised faster then aluminum because of sunlight and chemicals. Aluminum is compromised faster when a pool is not grounded properly or the pool has a salt system with higher than normal salt levels. In over three decades of replaceing vinyl swimming pool liners I've witnessed so many pool companies make terrible errors in correcting the issue of a pool liner that has fallen out of it's track. There are two huge errors that you should always avoid when putting your pool liner back in it’s track. These 2 mistakes that I know to be detrimental and will drastically increase your margin for error instead of success are heat guns and blow dryers. I have seen pool techs and homeowners try both ways. I’ve also noticed that previous pool companies had performed these two procedures with terrible results. Dry heat (Blow Dryers and Heat Guns) will burn your vinyl pool liner or even melt your liner when used to try and get a pool liner back in it's track. So How do you get a pool liner back in the track? The easiest way with the best chance for success is to follow Merodynamic Pools simple steps. First, make sure that your fingernails are trimmed! I have seen many times where homeowners or other pool companies try to put the liner back in and have embedded or marred the liner because of sharp fingernails. This marred part of the liner will become the first place that a tear may occur when cold water of winter constricts it or when hot weather expands it. Remember that any pool company that charges to perform this task is not specially trained, certified or has a degree in "liners out of their tracks".  It’s not hard to accomplish and the average person can accomplish putting their liner back in the track with ease and great results. Here are the steps that Merodynamic Pools follows: Boil a large (Spaghetti size) pot of water. Bring it to a rolling boil. Don’t be cautious. It will not hurt your liner. I find it easiest when I set the large pot of boiling water next to the area that the pool liner is out of the track and then I use a smaller pot to scoop the boiling water out of the large pot for easy pouring, accuracy, safety and to eliminate spilling t on yourself. Drop your water level (only if necessary) to the bottom of your skimmer. This gives you more available liner to heat up. With a high water level in your swimming pool it may still work but your percentages for success may be reduced because you have less bare liner above the water level to work with. I always try to get the liner in the track before I drop the level to save money.  Next, scoop your hot water into the small pot and pour all over the “Liner Bead”(the part at the top of the liner that has a lip on it that hooks into the track. The liner bead goes around the entire pool perimeter.) Pour water on the area that is out of the track and over the liner down to the water line. An easy way to guide the bead into it’s track is to grab the bead and fold it backwards behind the liner and against the structural wall. Then pull up on the liner bead above and passing the track upwards. After you have pulled it higher than the track that it is supposed to go in, start to lower it. This is when I guide it into the liner track where it belongs. If there is ever a small spot that gets pinched and does not go in flush with the track you can either heat it again and repeat these steps or use a credit or plastic card to push the pinched area in. Never use a blunt object such as screw drivers, keys, or something that could puncture the vinyl. This is an easy fix. Swimming Pool companies make a lot of money off of your lack of knowledge for pool liners that have come out of their tracks.  Here is a video we made to show you how this is performed.:   Please call Merodynamic Pools if you still have any questions about our procedures. We would be glad to explain it over the phone. 770-720-9905 Click Here to Ask a Swimming Pool Pro Now!

Do it Yourself Pool Liner? How To Install a Pool Liner? Can I Replace my own Pool Liner?


First of all, do not attempt this yourself. Please save yourself time and money.
Also, Pool liner Replacements are a trade & art form that should be left to a professional pool liner technician. There is a huge margin for error that can reduce your pool liners life expectancy when your swimming pool liner is not properly installed. Pool liner replacements should be done by an experienced pool liner installation company with no less than twenty years of on the job experience. This will result in a greater life of your new swimming pool liner. Merodynamic Pools experience with in ground swimming pool vinyl liner replacements just reached our 40th year.  Over 5700 in ground pool liners installed in the U.S.A.  Merodynamic Pools has mastered the tedious art form of vinyl liner replacement. Also, we must emphasize that In ground Swimming pool liners should only be handled by an experienced swimming pool liner technician with decades of on the job experience!
Furthermore, it is reckless when a pool company says that a do it yourself pool liner is easy in order to get a sale. Above all, they are putting your investment in harms way. Chances are you will call them back for a correct installation.


Installing a pool liner is difficult. We understand that every pool liner that we install serves up something different. Only a Professional Liner expert is prepared with knowledge and materials to deal with any unforeseen scenarios that may arise during your liner installation. When Replacement of an in ground swimming pool liner is needed You should have an expert Swimming Pool Liner Technician Handle it.    Saving money is great! But don't gamble on the chance that you may lose your hard earned money. Remember that the bitterness of poor quality will linger long after the thought of saving money and doing it yourself is forgotten. Did you know that your warranty is voided if not installed by a licensed dealer?


Our old school pool liner replacement techniques combined with modern state of the art pool liner replacement experience is the difference. Merodynamic Pools master swimming pool vinyl liner replacement team is the most knowledgeable and experienced liner company on the east coast.  One might be taught to Install a Vinyl Liner. The difference that a pool liner professional has is the on the job experience to visualize and notice the most minor details in your liner replacement process. Also, only an experienced professional will obtain your liners best life. The pool floor, the pool ramp, the pool back walls and the pool side walls must be resurfaced with precision accuracy to assure your Swimming pool liners best positioned fit and smoothness. Pool liner shifting adjustments are constantly needed for the best fit and longest life. Stretching will diminish you pool liners life expectancy. 13cDo it yourself pool liner


Do you know how to deal with ground water, water simulation, stripped screws, broken stair strips or structural integrity issues that may arise? What about the light removal and replacement, acquiring a great vac and many other secrets of the pool liner trade that only decades of experience has taught someone? Most pool companies don’t know how to deal with scenarios and will trial and error their methods because they lack experienced knowledge. As a result, they won’t tell about major problems that can occur because you never asked or they just don’t care about their customers. Furthermore, there are no pool liner videos, tutorials or phone support that will enable a person or inexperienced liner installer to accomplish a perfect liner replacement. It takes decades of training and first hand experience. While several companies show carelessness by telling you that you can install your liner yourself to get a liner sale, Merodynamic Pools is protecting our clients investments all over Atlanta Ga., North Georgia and all surrounding cities in Ga. 


   We sell liners nationwide Poollinerdepot.com and have been for years but we suggest to all of our clients to hire a professional for the installation. Finally, the fact remains that Your In Ground Swimming Pool Liner is an important investment in your property and will endure the Longest Possible Life if Installed by a certified In Ground Vinyl Liner Pool Specialist from Merodynamic Pools.   Our family at Merodynmaic Pools will Perfectly Install or Replace Your Swimming Pool Liner. As a result, our vinyl liners, Unmatched experience and Workmanship Guarantee will protect your swimming pool vinyl liner investment for years to come….Guaranteed. Contact Us Today. Click Here to Ask a Swimming Pool Pro Now! Kathy/Joel at Merodynamic Pools

InGround Swimming Pool Installation, How to

Inground Swimming Pool Installation, Georgia's premier pool company, Merodynamic Pools has over 3 decades of experience building in ground swimming pools. We strongly suggest that homeowners spend the money and have their swimming pool professionally installed. If you don’t install in ground pools daily it is very difficult to understand the proper swimming pool procedures for the projects best results. In comparison to a do-it-yourself job, a seasoned Atlanta Georgia Based Inground swimming pool installation company that repetitively performs daily pool installations will have a much greater chance to obtain much better results. You may view our "How to" pool install videos on the web and also read many of our educating tutorials. We receive at least 10 calls per year from homeowners wanting Merodynamic Pools to complete their project. Atlanta Georgia Swimming Pool Contractor, “Merodynamic Pools” is an award winning vinyl inground swimming pool installation and renovation pool company. BBB Accredited and known throughout Georgia for our “Customer is King” Policy and our award winning 5 star customer pool service. Our Specialties include: In Ground Swimming Pool Installs, Vinyl Pool Liner Replacement, Pool Safety Covers and Hot Tub Spas. With several Financing Options Available, Free Estimates and Great Pricing why wouldn’t you call our professional and courteous staff today? Merodynamic Pool builders continually maintains our “Swim in 2 Week” Integrity. Atlanta Georgia inground swimming pool installation Our in ground vinyl liner swimming pools look extravagant. We perform precise swimming pool construction so our pools last forever. At Merodynamic Pool & Spa we look for lifetime relationships. We now serve a 50 mile radius of Atlanta Georgia including all surrounding counties and cities. Call or visit today and let us show you how our “Experience” is the Merodynamic Pools “Difference”. We will beat any local and reputable pool builders price! Visit Merodynamic Pools at www.merodynamicpools.com for your free in ground swimming pool installation quote or call 770-720-9905  

How can I get the best life out of my pool liner, Vinyl Pool Liner Care

The best way to extend your swimming pool liner life is to maintain proper water balance and follow proper vinyl pool liner care procedures. When your water is properly balanced, and sanitizing agents (Chlorine, Bromine, Baquacil) are added to control bacteria, viral and contaminants, the result is balanced swimming pool water. Knowledge of pool chemistry is obtainable online or at your local swimming pool supply store. Balancing knowledge backed by the instructions of the chemical manufacturers, is a valuable resource in obtaining a long life for your vinyl pool liner.

Below are some proper balancing levels. PH  ……………………………………….7.2 to 7.8 ……………………….Test Daily Total Alkalinity…………………………60 to 125 ppm…………………Test Weekly Calcium Hardness…………………….150 to 250 ppm……………….Test Monthly Free Chlorine Range…………………1.0 (perfect) to 3.0 ppm……Test Daily ppm = parts per million

The most important factors in proper vinyl pool liner care is the control of water chemistry is pH and Chlorine. The pH is the measure of the acidity and alkalinity of the water, with 7.0 being neutral. Never allow the pH to fall below 7.0 into the acid range. Dropping below a 7.0 complex can prove to be very harmful to the liner. In this range the liner actually “grows” and develops unsightly burn wrinkles that cannot be removed, and the liner ages prematurely. Chlorine abuse is a major cause of liner aging and failure. A high concentration of chlorine will attack the liner, bleach it, cause it to ripple (burn)”, become brittle in areas and make the vinyl deteriorate rapidly. You should never allow chlorine to come into direct contact with a vinyl liner before it has been fully dissolved and thoroughly dispersed in the water. If you use granular chlorine, dissolve it in a bucket of water. If it doesn't dissolve then leave it overnight and stir once again in the morning. Pour the liquid around the pool perimeter, and thoroughly agitate the water to ensure that the chlorine is thoroughly dispersed. Never just throw the granules into the pool, as they will collect on the bottom and bleach or burn the vinyl. If you use chlorine tablets, You should add it to a chlorine feeder. Never add them directly to the pool, because they will certainly bleach and burn the vinyl. Stay away from floaters that hold tablets, the concentration will bleach out your liners border. If you use Calcium Hypo-chlorine tablets, you should never add them to the skimmer, as the chlorine vapor can overflow back into the pool when the pump/filter is turned off and bleach and burn the liner wall in the area of the skimmer. If you use liquid chlorine, pour it around the pool perimeter and agitate the water to thoroughly disperse it. To make sure the chlorine is thoroughly dispersed, it is a good idea in all cases to have the circulating pump running for a minimum of four hours after addition of chemicals. In adding chemicals to your pool water, remember that “more” is not “better”. Too much may actually be very harmful to your liner, and is certainly a waste of your hard earned money. For the sake of safety, never mix chemicals together. Add them one at a time. And always add chemicals to water – never the other way around. Never drain the pool to where you would have less than about one foot of water in the shallow end. If the water pressure is removed from the liner, even for a short time, the liner may shrink. In addition to being unsightly, this can cause the liner to tear in the corners or around fittings or steps. Most liners will eventually get a “ring” at the waterline from the accumulation of body oils, suntan lotions, etc. These can usually be removed by specially formulated cleaners that your pool dealer has available. But be sure that they are the kind meant for vinyl liners. Avoid the use of abrasive cleaning agents like steel wool, sharp bristled brushes, scouring pads, etc., as these can damage your liner. Never use gasoline, kerosene, or other petroleum based products, as these can cause your liner to deteriorate rapidly. Keep your filtration system in good working order so it can remove impurities and help in the dispersal of pool chemicals. If you should ever develop a leak in your liner, special patching glues are available from your pool dealer that allow you to repair the liner underwater, without having to drain the water. Water Testing Tips Water samples should always be taken no less than one foot below the water line. Stay away from return outlets to ensure that the samples are taken from the main water body. Before checking these samples, make sure that all the testers are clean and functional and that chemical testing reagents are fresh. Results obtained from defective equipment and reagents can themselves be defective, leading to the addition of wrong chemical dosages and inadvertent damage to the liner. The bottom line is that these vinyl pool liner care tips that we have provided will help you achieve your liners best life. From Kathy (The Owner), at Merodynamic Pools Q&A Blog