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Thread: What if my CYA is low?

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    antipode's Avatar
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    What if my CYA is low?

    What effect , if any, will it have on my water?

    Can I just go all season without it?
    12'x24' Oval Above Ground (Partially Buried)- 7000 gallons (est.)

    SwimPro Sand Filter

    Current pump: Hayward, 1.5 HP, SF 1, 15 amp (soon to be replaced)

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    Mod Squad JohnT's Avatar
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    Re: What if my CYA is low?

    If your CYA is low, you will have to be much more vigilant in keeping chlorine in the water. The sunlight during the day can consume a normal chlorine level in just a few hours with no CYA to protect it.
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    JasonLion's Avatar
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    Re: What if my CYA is low?

    That depends on how low. It gets rather difficult to keep chlorine in the pool when CYA is below 30. The lower CYA goes the worse that gets. At low CYA levels you are wasting chlorine and risking getting algae, so it is much better to not let the CYA level get too low.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    tedinelkgrove's Avatar
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    Re: What if my CYA is low?

    So what is the fastest way to get CYA back in your pool? I belive my CYA is ~20ppm. I threw a trichlor puck (or dichlor, not sure) into the pool but that could take a week or more. Is there a faster way?
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    frustratedpoolmom's Avatar
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    Re: What if my CYA is low?

    Pucks are trichlor.

    Dichlor is granular chlorine that contains CYA and it dissolves very fast, for every 10ppm of FC it raises your CYA by 9ppm.

    YOu can buy CYA/Stabilizer separately and add enough to raise your level into range.
    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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    tedinelkgrove's Avatar
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    Re: What if my CYA is low?

    OK, I bought a 1lb bag of Leslie's Chlor Brite. How much CYA will be added w/ one bag? How much Chlorine? Taking into account my pool volume.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    Butterfly's Avatar
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    Re: What if my CYA is low?

    Quote Originally Posted by tedinelkgrove
    OK, I bought a 1lb bag of Leslie's Chlor Brite. How much CYA will be added w/ one bag? How much Chlorine? Taking into account my pool volume.
    Chlor Brite is Dichlor, which contains CYA. You can use Jason's Pool Calculator (link in my sig) to calculate what effects it will have added to your pool.
    See the "Effects of Adding Chems..." near the bottom of the calculator.
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    tedinelkgrove's Avatar
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    Re: What if my CYA is low?

    Cool. I never noticed that there. Great feature. Thanks. That will raise my CYA by 4 and FC by 4.8. That along with the floating trichlor puck should bring CYA to 30+ shortly. MY FC held steady over night (0.5ppm loss) but drops like a rock during the day. I guess that happens when your CYA is 20ppm.

    Sorry for hijacking this thread, but at least I stayed on topic.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    antipode's Avatar
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    Re: What if my CYA is low?

    Hijack away. I'm learning right along with you.
    12'x24' Oval Above Ground (Partially Buried)- 7000 gallons (est.)

    SwimPro Sand Filter

    Current pump: Hayward, 1.5 HP, SF 1, 15 amp (soon to be replaced)

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    Re: What if my CYA is low?

    I'm not sure if anyone is still monitoring this post but, I have algae problems along with -30 cya. My Question is should i slam the pool 1st or just get the cya up first so that the pool holds the chlorine to kill the algae during the slamming process.
    We have a Intex 26' x 52" Ultra Frame Swimming Pool it holds 14,667 gallons of water. It is above ground. It is sitting on a 32x32 sand box. The pump we are running is hard lined inIntex 28681EG 120V 16-Inch Krystal Clear Sand Filter Pump & Saltwater System 2650 gal/hr pump. 1) Taylor Technologies Inc K-2006 complete Chlorine FAS-DPD test kit. 2) Taylor Technologies Inc K-1766 Drop test Chloride Salt water test kit

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