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Thread: How often chlorine and how much?

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    How often chlorine and how much?

    How often should I need to add chlorine? I find myself adding 1 to 2 gallons per day to maintain. That can't be right. ...right?! This will get expensive.
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    BoDarville's Avatar
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    Re: How often chlorine and how much?

    You will need to add enough chlorine to reach the target levels according to your pool's CYA. Refer to this chart: Chlorine CYA Chart. During the summer, chlorine must be added daily.

    Your pool is about the same size as mine, and I'm using about 100 oz per day to maintain my chlorine levels and this is high season for chlorine use. It does diminish rapidly after Labor Day.

    BTW, do you have any test results you can post?
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    Re: How often chlorine and how much?

    I added 2 gallons of bleach yesterday afternoon and tested this am:
    FC -1
    TC -0
    PH 7.4-7.6
    AL 70
    CYA 35
    CH 80

    - - - Updated - - -

    I guess my main question is.....if I have to add that much bleach per day....how is this going to be cheaper? It will run me about 6 bucks per day which will add up quickly
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Re: How often chlorine and how much?

    Bump your CYA up to 50 ppm. You'd be amazed at how much chlorine that will save you
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

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    BoDarville's Avatar
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    Re: How often chlorine and how much?

    Adding 2 gallons of 8.25% bleach will add about 6 ppm FC to your pool - this is in addition to the FC that was already present just before dosing with more bleach. If you added it late in the afternoon, you shouldn't be losing that much by morning. I would do an Overnight FC Loss Test. This takes sunlight out of the equation. If you lose more than 1 ppm FC overnight, then that is an indication that your pool may be in the early stages of an algae infestation or have some other form of organic contamination. This is a possibility even if your water is currently clear. If you lose 1 ppm or less overnight, then I would bump CYA up to around 50.

    One other point about your test results..If your FC is 1 , then your TC should be at least 1. FC + CC = TC.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    Re: How often chlorine and how much?

    I guess my main question is.....if I have to add that much bleach per day....how is this going to be cheaper? It will run me about 6 bucks per day which will add up quickly
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Re: How often chlorine and how much?

    and it appears it won't be cheaper.
    So
    - bump up CYA as suggested
    - run the OCLT to see if you have anything going on that shouldn't be
    - ensure you understand testing and recording for FC CC TC
    Pool installed 8/2015. 30' round Radiant pool. 21,000 gallons. 200# sand. Hayward Vari flow XL valve. 1.5hp Hayward Power-Flo Matrix running 10 hours/day in two periods. TF100 with speed stir. Sun all day, south side of house
    Order test kit TF-100 w/ Speed Stir and then Poolmath Calculator --- RECOMMENDED LEVELS --- POOL SCHOOL --- Algae? --- Chlorine/CYA CHART.

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    Mr Bruce's Avatar
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    Re: How often chlorine and how much?

    You shouldn't have to add 6ppm per day. 2-4 is normal loss. What BoDarville is telling you to try is called an OCLT. We suspect something is growing in your pool and that is how to check.

    FWIW we are pool twins and I use 1/2 bottle bleach per day, 2-3 ppm loss/day.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
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    borjis's Avatar
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    Re: How often chlorine and how much?

    With your posted FC at 1 and cya of 35, it sounds like you might have enabled some algae growth. Do the OCLT, I'd almost
    bet you will find your FC goes down over night.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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