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Thread: Draining 15-17 % of pool

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    Join Date
    May 2010
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    Daytona Beach, FL 32117 USA
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    Draining 15-17 % of pool

    Hi, I have the pool calculator for the iPhone and I took my current readings and plugged them into the program. I have a salt level of 4100 and want to get it down to 3500. The program recommends I drain 15% of my pool water. I have no idea how much this is. What should I do?Base it on inches or what?
    12k Gal. Kidney IG pool (Built around 1964 screened enclosure?), Tahoe Blue Diamond Brite (Added 12/2007), 1 hp motor, Sta-Rite P2 pump, Hayward C900 paper cartridge filter, Resilience SWG PSC-3 SCC 25 Element, Dolphin Robatic Cleaner, Lamotte ColorQ Pro 11, Taylor K2006C, Lamotte Tracer PockeTester PH/TDS/SAL, purptiger

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    Lershac's Avatar
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    May 2007
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    Re: Draining 15-17 % of pool

    Clean out a Gallon Milk Jug. Fill it up with pool water. Go dump it down the toilet. Repeat about 1800 times.
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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    Lershac's Avatar
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    May 2007
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    Re: Draining 15-17 % of pool

    sorry, I just left the jokes thread...
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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    Denton, TX
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    Re: Draining 15-17 % of pool

    Quote Originally Posted by Lershac
    Clean out a Gallon Milk Jug. Fill it up with pool water. Go dump it down the toilet. Repeat about 1800 times.
    Why, that's exactly how I would do it.

    No really though, you basically just need to drain off a little bit less than 1/4 of your water. If you pool is say, 8 feet in the deep end and 4 feet in the shallow end, then your average depth is 6 feet. 1/4 of that would be 1.5 feet. You would need to drain less than that. Basically, I would drain a foot of water off and refill and retest.

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    Dec 2009
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    Re: Draining 15-17 % of pool

    Unless your SWG is not generating chlorine and is giving you an error of "high salt", I wouldnt do anything. How did you measure your salt levels? Depending on how you measured, a lot of the tests and the reading you get on your SWG itself, will be off by some percentage. In most cases, an error of 300-500 ppm can be expected. Again, if your generator is making chlorine and is happy, the salt level will go down over time through splash out and rain dilution. If however, it is not operating due to high salt, you can figure out gallons per inch fairly easy.

    You dont say how big your pool is and I see its a kidney shape so it might be a bit more difficult. But, the area of the pool multiplied by 0.083 (1/12/) gives you a volume in cubic feet. You can then calculate how many gallons of water is in that volume of pool.
    For eample, my pool is 16 x 30. Thats roughly 480 sq ft give or take since its a kindney, but its close enough. Multiply that by 0.08 and that gives you 38.4 cubic feet. There are 7.43 gallons in a cubic foot, so 1 inch of water in a 480 sqft pool is equal to ~285 gallons. My pool is 14,000 gallon, so 17% would be 2380 gallons or about 8.5 inches of water.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: Draining 15-17 % of pool

    Based on a prior bad experience, I'd have the salt level verified by a couple independent tests. I concur with bk 406 and not drain unless there is a good reason....
    South Florida. 20,000 gallons; 16x35 rectangular gunite; Pentair Intelliflo VF Variable Speed Pump; Hayward cartridge; Aqua Rite SWG. Dolphin Oasis Z5 Robotic Pool Cleaner; Kopec 540sc Electric Heat pump pool heater; Pool built in Spring 2004.

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