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Thread: is low CYA harmful to a vinyl liner?

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    borjis's Avatar
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    is low CYA harmful to a vinyl liner?

    Because CYA acts as a buffer to chlorine...does that mean that little to zero cya is bad for a liner
    as the chlorine is then "more harsh." or is it less harsh to swim wear and skin more than anything else?

    I had CYA of 30 just before winter started...I have zero now due to lots of rain and having to
    drain down to keep the fill level correct.

    Very curious about this since my liner is brand new.

    I've ordered more cya to get it back up again.

    I keep my chlorine levels always between the recommended 2-6ppm for a cya level of 30
    since 30 works best for me (pool mostly shaded)
    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.
    Dolphin E10 Cleaning Robot.

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    JoyfulNoise's Avatar
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    is low CYA harmful to a vinyl liner?

    If you maintain the proper FC/CYA ratio, then no it's not since the hypochlorous acid level is the same. The problem is, when you get to low CYA levels, it's harder to maintain a smaller FC value.

    Your liner should be fine. It has to be exposed to really high active chlorine levels (shock values) to be worried about liner colors fading.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    borjis's Avatar
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    Re: is low CYA harmful to a vinyl liner?

    thanks Matt, that makes sense.
    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.
    Dolphin E10 Cleaning Robot.

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    JoyfulNoise's Avatar
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    Re: is low CYA harmful to a vinyl liner?

    You could just switch to dichlor chlorination until your CYA builds up.

    And, you very likely have some CYA in the water. The Taylor test is hard to read below 30ppm.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: is low CYA harmful to a vinyl liner?

    Dichlor is not a fave around TFP because it adds CYA and you need to be able to account for that in your calculations. However, that's what I use for CYA additions. (I was lucky enough to buy a 50# pail of granules a couple of years ago. Now, you may have to buy 1# bags). EDIT: Pails are still available but the prices vary significantly.

    I keep my CYA at low levels so if it drops a tad, I can't measure it accurately. A bit of dichlor for FC instead of bleach works a treat until my CYA once again registers. Then I switch back to liquid chlorine.

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    borjis's Avatar
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    Re: is low CYA harmful to a vinyl liner?

    I spent 100's of dollars one season to correct 300+ cya (water rates where I used to live were highway robbery)
    on my last pool.

    So now, I hate pucks on principle, but 'might' use them if I'm ever away for a week vacation.
    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.
    Dolphin E10 Cleaning Robot.

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    Re: is low CYA harmful to a vinyl liner?

    I bought my granules (NOT pucks) for $2/#. Granules allow you to add only exactly what you can measure and they are quickly measurable.

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    borjis's Avatar
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    Re: is low CYA harmful to a vinyl liner?

    wow where did you get them that low of a cost?
    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.
    Dolphin E10 Cleaning Robot.

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    Re: is low CYA harmful to a vinyl liner?

    Sam's Club sells 50 pound pails for $109.99. (I paid $99 a few years ago). However, they only carry it in season. I checked an Ocala, Florida Sam's Club and they have it in stock now. Maybe the Northwest stores will stock it in Spring. http://www.samsclub.com/sams/chlorin...uestid=1479434

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