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Thread: Summer time How much chlorine should I expect to lose a day?

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    Join Date
    Jul 2011
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    San Jose, Ca
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    Summer time How much chlorine should I expect to lose a day?

    I have a 15,000 gallon fiberglass pool with east exposure. Trees block out the sun during the warmer afternoons. My recent test readings:

    FC 5
    CH 140
    CYA 50
    TA 90
    pH 7.8
    Pho 300

    FC drops 2 per day. Is this excessive? During winter times I add 8-16oz per day of liquid bleach. Now I have to add 64oz a day. Its not that hot so far this year. I can't imagine what I have to add daily once it gets really hot. TIA.
    15,000 gallor fiberglass, kidney shade pool. San Jose, California

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    Mod Squad jblizzle's Avatar
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    Re: Summer time How much chlorine should I expect to lose a

    2-4 ppm per day seems pretty typical. Sun on the pool has a larger affect than the air temperature as far as consuming the FC.

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    Jason, TFP Moderator
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    Jul 2011
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    Re: Summer time How much chlorine should I expect to lose a

    Ouch. That will run about $30 a month on liquid bleach from Costco. Need to find a cheaper source. Thanks.
    15,000 gallor fiberglass, kidney shade pool. San Jose, California

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Summer time How much chlorine should I expect to lose a

    2 ppm a day is normal, 4 ppm a day is excessive.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    stev32k's Avatar
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    Mar 2009
    Location
    Mobile, Alabama
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    Re: Summer time How much chlorine should I expect to lose a

    Since shocking my pool earlier this year I'm averaging less than 2 ppm per day and the pool gets full sun for about 11 hours per day. I maintain a CYA of 40 - 45 and chlorine at 4 - 7. The pool chemistry has been amazingly stable and the water as clear as clean glass even though we've had strong storms that blew in a lot dirt and debris.
    20' x 40' IG with vinyl liner volume approx. 35,000 gal.1.5 H.P. main pump, Polaris 280 cleaner W/ 3/4 H.P. booster pump
    Hayward sand filter, 3.14 sq ft, 62 gpm. Stenner 45 MPH10 chlorine feed pump. 1 micron final filter bags (home made and very effective)

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