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Thread: Chlorine Loss

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    Chlorine Loss

    Not sure if there is an answer, but if there is I am sure you guys know. Is there anyway to determine what a normal loss of chlorine is per day?
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
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    JasonLion's Avatar
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    Re: Chlorine Loss

    It varies quite a bit from pool to pool and depends on your CYA level, the weather, and how much the pool is shaded from the sun, etc. A typical FC loss is around 2 ppm/day, but the range is more like 0.5 to 4 ppm.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Chlorine Loss

    Quote Originally Posted by JasonLion
    It varies quite a bit from pool to pool and depends on your CYA level, the weather, and how much the pool is shaded from the sun, etc. A typical FC loss is around 2 ppm/day, but the range is more like 0.5 to 4 ppm.
    Wow that is a lot. So even with adding bleach every day you could go through a lot of bleach.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

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    Re: Chlorine Loss

    Well, yes, but if it concerns you then there are a few things you can do to reduce it: tweak your CYA up a little bit (in Texas, 50 or even 60 is pretty common), use a cover (reduces evaporation loss as well as a bit of FC loss).

    If you think your chlorine loss is on the high side, then an Overnight FC Loss Test will tell you whether it's due to organics.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
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    Mod Squad Bama Rambler's Avatar
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    Re: Chlorine Loss

    As Jason said it varies a lot from pool to pool but you can get a pretty good idea of your pools normal usage. You can use the pool calculator to help.

    Here's how I did it. I tested the FC every evening and used pool calc to figure how much bleach to add. I then took that number and entered it in the "Effects of adding chemicals" section of PC to get how many ppm that much bleach would raise the FC and I charted that for a few weeks to get my normal usage. I also used that as I adjusted the CYA to tell how much it changed the usage. I use about 1½ quarts of 6% bleach per day. Which is about 2ppm per day.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    frustratedpoolmom's Avatar
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    Re: Chlorine Loss

    I lose very little when the pool is not in use and the solar cover is on, prob .5 or so. When the cover is off and we are swimming on a hot sunny day it's closer to 2.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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