The Association of Pool and Spa Professionals recommends free chlorine levels for both swimming pools and hot tubs be kept between 2.0 and 4.0 ppm. However, the Center for Disease Control recommends free chlorine stay above 1 ppm in pools and 3 ppm in hot tubs. Pool Calculator provides the tools and maintenance information you need to keep your ...Oct 18, 2023 · About Trouble Free Pool New. 440. 7.5K. C. Where is my return Line? I want to blow out the lines to winterize. Oct 18, 2023. canadianpoolz. First step is to adjust salt to the manufacturer's recommended range (usually around 3000-3200 ppm but some models do need a higher level. Check your manual.) Starting out slightly higher (200-400 ppm) than the ideal level is recommended, since the salt level will tend to fall over time. Second adjust CYA to between 70 and 80.Pool school is a collection of concise, easy to understand articles designed for the average pool owner. The articles have been carefully written and arranged to take you through a natural progression of pool care topics. The articles are broken down by category and arranged so that the basic topics are covered first, building into each ...Disclaimer: Results from mining calculator are estimation based on the current difficulty, block reward, and exchange rate for particular coin. Errors can occur, so your investment decision shouldn't be based on the results of this calculator. Latest update: 25 …Knowing the pool volume is extremely important when adding chemicals to the water to adjust pool chlorine, pool pH, pool stabilizer, pool alkalinity, pool salt and other chemical levels. After calculating the pool volume gallons, use the other calculators to help balance the chemicals. Quickly get answers for how much chlorine to add to the pool or how to balance the pool ph and alkalinity ...We recently drained and filled up our pool and have been using the trouble free pool calculator for everything and it has been looking good. I test with the Tf 100 kit and my reading was and still is CYA 40. Their analysis was 0, they tested twice using the strips and the chemicals and say there...The SLAM will kill the algae but you have to brush and filter 24/7 for a few days to filter it out.The clarifier binds to the algae to make bigger particles for your filter to capture. The clarifier only works if the algae is dead, so its likely was that your filter wasn't doing it's job. Dead algae is green also. Step 1. Balance Your Water. First, test your pool water and balance it properly. For ideal levels, you need to have your pH level between 7.4 and 7.6, total alkalinity between 80 and 120 ppm (parts per million), and chlorine between 1 and 3 ppm. As for calcium hardness, it should be between 200 and 400 ppm.Jul 29, 2023 · How do you use the pool calculator? It just keeps bringing me to the page but no calculations ... About Trouble Free Pool Aug 9, 2023. ajw22. Salt calculator. woodyp ... It is our mission. to help owners troubleshoot all the parts of their pools, making understanding and maintaining their pools a more simple, pain-free task. Visit our forum for more information and a friendly community. Figure out how to check the levels in your pool and more. Pool School is a collection of concise, easy to understand articles.Poolmath - Trouble Free Pool. WebDiscover the pool calculator behind the perfect pool, PoolMath.Dealing with pools has allowed TFP to become the original authors of the best calculator on the net.Shock: Mustard Algae Shock: Suggested target FC levels based on the CYA level in the Now column for outdoor pools.Note: Be careful if your CYA is really …PoolCalculator .com The Pool Calculator takes care of all the math that might come up while you are keeping your swimming pool's water chemistry in balance, telling you exactly how much of each chemical to add. For background on what the various numbers mean, see Basic Pool Chemistry .Calculators for pH, Free Chlorine, Calcium Hardness, Salt, Total Alkalinity, Calcium Hardness, Borates, CSI Track Maintenance: Backwashing, Vacuuming, Filter Cleaning, Filter Pressure, SWG Cell %, Flow Rate Track Chemical Additions Track Pool Related Expenses Track Weather conditions with your logsJul 8, 2016 · UPDATE 7/20/2016: Added a new SWG Run Time Chart to quickly see various run time values at multiple % output and multiple FC demands. Basic instructions: 1. Enter Pool Size in gallons. 2. Enter your Average 24 hr FC (free chlorine) demand. (this value will likely be between 1 and 4) 3. In order to calculate WEF of a VS pump, two measurements are combined with a weighting factor for each. One measurement is performed at 80% of full speed with a 20% weight while the second measurement is performed at a lower speed with a specific flow rate (e.g. 31.1 GPM for HHP > 0.75) and a 80% weight.1. Two tailed test example: A factory uses two identical machines to produce plastic plates. You would expect both machines to produce the same number of plates per minute. Let μ1 = average number of plates produced by machine1 per minute. Let μ2 = average number of plates produced by machine2 per minute. We would expect μ1 to be equal to μ2.Maksud trouble-free dalam kamus Corsica dengan contoh kegunaan. Sinonim trouble-free dan terjemahan trouble-free ke dalam 25 bahasa.May 31, 2018 · Many moons ago TFP did use the PoolCalculator as it was originally created by JasonLion, former TFP Admin. As time went on the name exchanged hands yet TFP held a license for the code behind the page the entire time. After awhile TFP setup and updated the page you see here so we could make some updates to the math behind the scenes. pour the dissolved Borax in the bucket slowly into the pool. brush the entire pool if you see any undissolved Borax to mix it in and get it dissolved. For pools smaller than 10,000 gallons it is better to add a half gallon of 31.45% muriatic acid followed by about 1 3/4 boxes of Borax each time.The pooled standard deviation is a weighted average of two standard deviations from two different groups. It is typically used in a two sample t-test. To calculate the pooled standard deviation for two groups, simply fill in the information below and then click the “Calculate” button. Enter raw data Enter summary data. Sample 1. Sample 2.Jul 15, 2020 · With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations. PoolMath makes swimming pool care, maintenance and management easy by tracking chlorine, pH, alkalinity and other levels to help calculate how much salt, bleach and other chemicals to addThe general recommendation is to use one pound of cal hypo shock for every 10,000 gallons of pool water, and 10 ounces of sodium hypo with around 12.5% chlorine to sanitize your pool. Make sure the pool water is at its normal level. Make sure your pool's pH is between 7.2–7.6 and its alkalinity is between 80–120 ppm.Knowing the pool volume is extremely important when adding chemicals to the water to adjust pool chlorine, pool pH, pool stabilizer, pool alkalinity, pool salt and other chemical levels. After calculating the pool volume gallons, use the other calculators to help balance the chemicals. Quickly get answers for how much chlorine to add to the pool or how to balance the pool ph and alkalinity ...We want to calculate the distance between the two points (-2, 1) and (4, 3). We could see the line drawn between these two points is the hypotenuse of a right 779 PhD Experts 78% Recurring customers 70344+ Clients Get Homework Help. What our …Jul 8, 2016 · UPDATE 7/20/2016: Added a new SWG Run Time Chart to quickly see various run time values at multiple % output and multiple FC demands. Basic instructions: 1. Enter Pool Size in gallons. 2. Enter your Average 24 hr FC (free chlorine) demand. (this value will likely be between 1 and 4) 3. A calculator helps people perform tasks that involve adding, multiplying, dividing or subtracting numbers. There are numerous types of calculators, and many people use a simple electronic calculator to perform basic arithmetic.Knowing the pool volume is extremely important when adding chemicals to the water to adjust pool chlorine, pool pH, pool stabilizer, pool alkalinity, pool salt and other chemical levels. After calculating the pool volume gallons, use the other calculators to help balance the chemicals. Quickly get answers for how much chlorine to add to the pool or how to balance the pool ph and alkalinity ...Hi, i'm trying to learn a little bit more about how to work with the pool calculator. How do i make it so that my goal numbers stay the same everytime i log on? Can i personalize my settings? (Salt level, desired PH, as an ex if i want my PH a little different than the given, or gallons to stay...Provided by Alexa ranking, freepoolcalculator.com has ranked N/A in N/A and 996,967 on the world.freepoolcalculator.com reaches roughly 3,142 users per day and delivers about 94,251 users each month. The domain freepoolcalculator.com uses a Commercial suffix and it's server(s) are located in N/A with the IP number …From the Trouble Free Pool website: Pool Math makes swimming pool care, maintenance and management easy by tracking chlorine, pH, alkalinity and other levels to help calculate how much salt, bleach and other chemicals to add. Pool Math performs all the calculations you need to keep your chlorine, pH, calcium, alkalinity, and stabilizer levels ...Download Pool Math by TroubleFreePool and enjoy it on your iPhone, iPad and iPod touch. PoolMath makes swimming pool care, maintenance and management easy by tracking chlorine, pH, alkalinity and other levels to …Search titles only By: Search Advanced search…Use PoolMath to calculate exact amounts to add. Sanitation 1. On a fresh fill use Dichlor until you get to 20-30 ppm CYA. (10 ppm FC = 9 ppm CYA) Then switch to plain bleach or liquid chlorine. Never let FC drop to Zero for any length of time. Keep it between 3-6 ppm normally, min of 1 ppm, and shock to 12 ppm once a week.Find the value of a function derivative at a given point. derivative-point-calculator. Get mathematics support online; Reach support from expert teachers; Decide mathematic tasks; Solve Now! How to Estimate the Derivative at a Point Based on a Graph. Problem: Given a function f and a specific x-value x = c, compute the slope of the line tangent ...Use for the Sustain® 3-Part System. 1. To estimate how much of each chemical you will need, the first step is to determine the volume of your pool. The following form represents an easy method to calculate pool volume. Rectangular Pools: Length x Width x Average Depth x 7.5 = Total Gallons. ft.TroubleFreePool In-app purchases 3.7 star 274 reviews 50K+ Downloads Everyone info Install About this app arrow_forward PoolMath makes swimming pool care, maintenance and management easy by...Discover the pool calculator behind the perfect pool, PoolMath. Dealing with pools has allowed TFP to become the original authors of the best calculator on the net. To help you better understand the calculator and keep your water clean and clear, you should also view the following: ABC's of Pool Water Chemistry FC/CYA Chart Web site calcr offers users a very simple but useful online calculator. Web site calcr offers users a very simple but useful online calculator. As you perform your calculations, calcr dynamically creates a tape that tracks each calculation....Gallon / Liters Conversions. Convert gallons to liters and vice versa. AquaChek’s easy to use calculators take the guesswork out of balancing your pool or spa.I am new to this forum and it looks like a lot of knowledge is available. I have a question about how to gain access to THE POOL CALCULATOR. It allows me to enter information but when I hit calculate nothing happens. Do I need to download and if so how? Thanks in advance.Looking for a pool calculator to help you calculate exactly what chemicals you will need to keep your pool water safe and sanitary? 732-451-1040 [email protected] Pool Management Education since 1980Interesting web calculator. Very accurately knew what my nat gas costs were (I cross checked against my bill). But the most interesting result was if I heated the pool to 84F starting in April and continuing to use the heater until the end of September, my gas costs would be ~$950. If I used a solar bubble cover during that time, my gas costs ...With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations.It is our mission. to help owners troubleshoot all the parts of their pools, making understanding and maintaining their pools a more simple, pain-free task. Visit our forum for more information and a friendly community. Figure out how to check the levels in your pool and more. Pool School is a collection of concise, easy to understand articles.Chlorine. Salt Water Generator. SWG Type. Pentair Intellichlor IC-60. Mar 5, 2017. #2. See the PoolMath Link above at the top of the page. Simply change the volume of the water to 525 gallons and it will calculate everything you need. Also, see these stickies for how to operate a hot tub -.It is our mission. to help owners troubleshoot all the parts of their pools, making understanding and maintaining their pools a more simple, pain-free task. Visit our forum for more information and a friendly community. Figure out how to check the levels in your pool and more. Pool School is a collection of concise, easy to understand articles.hi all -. i'm pretty new to this website and based on help i received last year i am trying liquid chlorine for the first time. so far its a total flop! 1) according to PoolMath one gallon of 12.5% chlorine should add 6ppm of chlorine to my 21k gallon pool. but it does not seem to. i have been adding a full gallon a day and it never goes that ...Any suggestions? Water is about a month and a half old on our first tub. Viking Traditions 2 Water or edges are not slimy. Ph 7.6 tonight TA 110 (a…Knowing the pool volume is extremely important when adding chemicals to the water to adjust pool chlorine, pool pH, pool stabilizer, pool alkalinity, pool salt and other chemical levels. After calculating the pool volume gallons, use the other calculators to help balance the chemicals. Quickly get answers for how much chlorine to add to the pool or how to balance the pool ph and alkalinity ... The milliliters (ml) and grams (g) are small enough units to be precise even with small spa volumes. There are 29.57 milliliters in a fluid ounce -- easy enough to just use 30. So dividing the ml number by 30 gives you fluid ounces. Likewise, dividing by 4.93 (or roughly 5) gives you teaspoons.Allows for the complete dilution and dissolving of pool water balancing chemicals and a safe, operator friendly method for dosing large quantities of chemicals into a commercial pool system.#1 I see that the pool calculator has changed since last year! I like it, except for the fact that I'm not sure what to put in for the type of chlorine I am using. [emoji848] Report M mclifford 0 Aug 29, 2017 189 Van buren, AR May 31, 2018 #2 Same stuff I have been using. Just use 10% in the calculator. To add more:PoolMath makes swimming pool care, maintenance and management easy by tracking chlorine, pH, alkalinity and other levels to help calculate how much salt, bleach and other chemicals to add. Keep swimming in your TroubleFreePool with Pool Math. Crystal clear algae free pool water is what Trouble Free Pool Math is committed to. Use for the Sustain® 3-Part System. 1. To estimate how much of each chemical you will need, the first step is to determine the volume of your pool. The following form represents an easy method to calculate pool volume. Rectangular Pools: Length x Width x Average Depth x 7.5 = Total Gallons. ft.The Pool Calculator (by Pool and Spa Resources) Chemical, volume $4.99 Pool Water Calculator (by Dominic Petrazio) Water balance/water chemistry Free Pool Chem Dose Calculator (by Robert Lowry) Calculates dosage for 38 chemicals $2.99 Pooli (by Pooli, Inc.) Pool chemical calculator has a test strip analyzer. Free Pool Math (by TroubleFreePool ...Discover the calculator behind the perfect pool, PoolMath. Dealing with pools has allowed TFP to become the original authors of the best calculator on the net. www.troublefreepool.com Quick Navigation Second Link... Reply. Report. woodyp. Mod Squad. TFP Expert. LifeTime Supporter. Apr 17, 2010 12,357 East Texas. Apr 20, 2023; Add bookmarkDescription. This procedure calculates the difference between the observed means in two independent samples. A significance value (P-value) and 95% Confidence Interval (CI) of the difference is reported. The P-value is the probability of obtaining the observed difference between the samples if the null hypothesis were true.With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations.If you need help with your order, please email us at [email protected]. Please check your email inboxes and spam folders for updates from our Endicia shipping software ( [email protected]). Thank you for your continued support of TFtestkits. Best, The TFTeam. Call or Text (919) 283-6035.Crystal clear, blue, algae free pools made easy! Let us do the Pool Math!Step 1. Balance Your Water. First, test your pool water and balance it properly. For ideal levels, you need to have your pH level between 7.4 and 7.6, total alkalinity between 80 and 120 ppm (parts per million), and chlorine between 1 and 3 ppm. As for calcium hardness, it should be between 200 and 400 ppm.Pool Circulation Systems. Pool Water circulation systems are necessary to keep your water pool clean, comfortable, and algae-free. We discuss the key items to keep your water clean. Your one-stop shop for all things TFP to include: ABCs of Water Chemistry, Recommended Chemicals/Levels, Test Kits, Troubleshooting, and much more!A calculator helps people perform tasks that involve adding, multiplying, dividing or subtracting numbers. There are numerous types of calculators, and many people use a simple electronic calculator to perform basic arithmetic.I have a question about the pool math calculator. I have found bleach in my area that is 6% and 8.5%. I also found 10% that is sold out by the pool supplies at lowes. My question is when I enter that percentage into the pool math calculator I noticed it changes from "weight" to "trade". Am I...Chlorine – salt is used in conjunction with a salt water chlorinator to generate chlorine. Use stabilised chlorine (contains cyanuric acid to stop chlorine from disappearing in uv light) or if no uv, you can use unstabised chlorine or bleach – use troublefreepool calculator to get right levels per litre. User #121574 1259 posts.ng/µl. Pooled Library Concentration (nM) Total Pooled Library Volume (µl) Description (optional) Library Concentration (nM) Library Volume (µl) 10 mM Tris-HCl, pH 8.5 (µl) Pooling Volume (µl) Total Pool Volume.The formula for calculating cost of sales is adding the starting inventory, inventory purchases and overhead expenses together and subtracting that number from inventory at the end of the year, according to Chron.Check pool chlorine levels often. Chlorine is the most popular disinfectant for swimming pools. There are three main measurements for chlorine, Free Chlorine(FC), Combined Chlorine(CC), ad Total Chlorine(TC). Free Chlorine is most commonly tested because it represents the amount of chlorine free for disinfecting. Chlorine is very effective at eliminating most microorganisms in the water that ...Chlorine. Salt Water Generator. SWG Type. Pentair Intellichlor IC-60. Mar 5, 2017. #2. See the PoolMath Link above at the top of the page. Simply change the volume of the water to 525 gallons and it will calculate everything you need. Also, see these stickies for how to operate a hot tub -.I told him i review each customers water when I get home and use Pentair's online LSI calculator ( tis quick) For the pool in question the pH is 7.5; Alk 75 ish. CH: in the 280's ; more importantly the water Temp : in the mid 80's. So if i remember, the LSI is pretty much near 0.00.A two sample t-test is used to test whether or not the means of two populations are equal. This type of test assumes that the two samples have equal variances. If this is not the case, you should instead use the Welch’s t-test calculator. To perform a two sample t-test, simply fill in the information below and then click the “Calculate ...Do you think someone would modify the pool calculator to add 8.25% bleach in a 121 oz jug? I'm not so bright with math, so this would surely help. I am trying to get my FC from 14 to 24 and can't figure it out without the calculator (thus I'm using the 128 oz calculation). And, I also saw...Nov 1, 2021 · With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations. MedCalc's free online Odds Ratio (OR) statistical calculator calculates Odds Ratio with 95% Confidence Interval from a 2x2 table.Swimming pool maintenance guides to aid pool water balance and pool maintenance. Includes useful pool calculators. A focus on the Pool Wizard - a low chlorine alternative to algae control. Details on maintaining swimming pools, pool problems, pool chemicals, water chemistry and advice and information for pool owners.Interesting web calculator. Very accurately knew what my nat gas costs were (I cross checked against my bill). But the most interesting result was if I heated the pool to 84F starting in April and continuing to use the heater until the end of September, my gas costs would be ~$950. If I used a solar bubble cover during that time, my gas costs ...TDS is a measurement of all solids, good and bad, that are dissolved in your pool water. The TDS level in your pool will rise over time for several reasons, including evaporation, a faulty filtration system, and water quality. The ideal TDS level for freshwater pools is around 500-2,000 mg/L; for saltwater, the ideal level is 5,000-6,000 mg/L.वापर करण्याच्या उदाहरणांसह इंग्रजी शब्दकोशातील trouble-free अर्थ. 25 ...Date Calculator: Add to or Subtract From a Date. Enter a start date and add or subtract any number of days, months, or years. Count Days Add Days Workdays Add Workdays Weekday Week №.PoolMath makes swimming pool care, maintenance and management easy by tracking chlorine, pH, alkalinity and other levels to help calculate how much salt, ble...Gallon / Liters Conversions. Convert gallons to liters and vice versa. AquaChek’s easy to use calculators take the guesswork out of balancing your pool or spa.The Pool Calculator takes care of all the math that might come up while you are keeping your swimming pool's water chemistry in balance, telling you exactly how much of each chemical to add. ... Not Setup Traditional Pool TroubleFreePool.com Traditional Spa. Primary source of chlorine: Not Setup Bleach SWG Trichlor. Pool surface: ...pour the dissolved Borax in the bucket slowly into the pool. brush the entire pool if you see any undissolved Borax to mix it in and get it dissolved. For pools smaller than 10,000 gallons it is better to add a half gallon of 31.45% muriatic acid followed by about 1 3/4 boxes of Borax each time.A calculator helps people perform tasks that involve adding, multiplying, dividing or subtracting numbers. There are numerous types of calculators, and many people use a simple electronic calculator to perform basic arithmetic.Feb 18, 2023 · Potassium chloride will also work, but you need 28% more of it and it is more expensive. Avoid table salt, rock salt, and deicing salt. Salt can simply be dumped into the pool. Spread it around a bit with a brush so there aren’t any large piles, and leave the pump running for 24 hours after adding salt.
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Do you think someone would modify the pool calculator to add 8.25% bleach in a 121 oz jug? I'm not so bright with math, so this would surely help. I am trying to get my FC from 14 to 24 and can't figure it out without the calculator (thus I'm using the 128 oz calculation). And, I also saw...May 14, 2022 · PoolMath. Discover the calculator behind the perfect pool, PoolMath. Dealing with pools has allowed TFP to become the original authors of the best calculator on the net. www.troublefreepool.com. It's a link at the bottom of the page called Old PoolMath Webpage. On the right. That said, I highly recommend PoolMath as an app. The Pool Calculator. The Pool Calculator takes care of all the math that might come up while you are keeping your swimming pool's water chemistry in balance, telling you …The Pool Calculator (by Pool and Spa Resources) Chemical, volume $4.99 Pool Water Calculator (by Dominic Petrazio) Water balance/water chemistry Free Pool Chem Dose Calculator (by Robert Lowry) Calculates dosage for 38 chemicals $2.99 Pooli (by Pooli, Inc.) Pool chemical calculator has a test strip analyzer. Free Pool Math (by TroubleFreePool ...I told him i review each customers water when I get home and use Pentair's online LSI calculator ( tis quick) For the pool in question the pH is 7.5; Alk 75 ish. CH: in the 280's ; more importantly the water Temp : in the mid 80's. So if i remember, the LSI is pretty much near 0.00.A Trouble Free Pool . Posted on Dec 12, 2018 at 9:21 PM. Updated on Updated on Sep 25, 2023 at 7:55 AM. The SLAM process is the best way to eliminate algae, sanitize your pool, and achieve crystal clear water. You cannot complete this process overnight! ... Use our PoolMath calculator to determine this amount. Remove leaves and visible debris ...Hi, i'm trying to learn a little bit more about how to work with the pool calculator. How do i make it so that my goal numbers stay the same everytime i log on? Can i personalize my settings? (Salt level, desired PH, as an ex if i want my PH a little different than the given, or gallons to stay...To get to 0.4 ppm copper ions in a 10,000 gallon pool, you would need (0.4 mg Cu/liter) * (10000 gallons) * (3.7854 liters / gallon) * (249.7 mg CuSO 4 •5H 2 O) / (63.546 mg Cu) * (1 ounce / 28350 mg) = 2.1 ounces weight of copper sulfate pentahydrate. If you absolutely have to use a supplemental method other than chlorine at the ...Jul 22, 2016 · The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations. Please consider Supporting TFP! The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations. Please consider Supporting TFP!Within a few days you will know your pools daily chlorine usage and how much liquid chlorine is required. For example, with a 10,000 gallon pool, adding 40 ounces of 10% liquid chlorine will raise the free chlorine by 3.1 ppm. If 5% liquid chlorine is used it will require 70 ounces of liquid chlorine to add 3 ppm of free chlorine.Jun 8, 2013 · With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations. .
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