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Thread: Zero CYA???

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    Join Date
    Apr 2010
    Location
    Southern California
    Posts
    83

    Zero CYA???

    Went to a nearby pool store for the first time to get a full set of numbers. My kit does not test for CYA, but I added it based on the directions on the CYA bottle and I added 4 pounds, which was the full bottle. Since then I have probably only replaced around 6" of water in the pool. Anyway, the guy at the store said I have ZERO CYA, which does not seem possible to me, based on the fact that water replacement is the only way to lose CYA, and I have not replaced very much.

    So is it even possible that I could really have no CYA at all?
    12,000 gallon IG (newly re-plastered) pool, Pentair 3/4hp pump, DE filter, TF-100 test kit

  2. Back To Top    #2

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Zero CYA???

    It's very unlikely. There is a way for the CYA to go away, but only if your Free Chlorine (FC) level went to zero and bacteria converted the CYA into ammonia (and intermediate chemicals on the way from CYA to ammonia). If that happened, you'd have a very high chlorine demand and a zero FC reading.

    The most important advice given on this forum is to get yourself a good test kit such as the TF-100 or the Taylor K-2006. Without a good test kit you are simply shooting in the dark. A proper test kit will pay for itself many times over in chemical savings and in the time saved from not having to fix problems with the pool. Pool stores are notorious for giving incorrect test results, especially for the CYA test, and using test strips often gives the wrong CYA reading as well. Please, please get yourself a proper test kit.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    solarboy's Avatar
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    Aug 2010
    Location
    Europe
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    337

    Re: Zero CYA???

    I second that. Sadly I only have test strips. I've added enough Trichlor without backwashing to have 40ppm CYA yet the strips show nada.
    Self built 5500 gallon bare concrete (temporarily) pool with limestone coping, Pentair Swimmey 1/2 HP pump, Triton sand filter with DE, Simpool peristaltic muriatic acid pump with pH sensor and Monarch SWG. Home made solar heater with Pentair Compool control panel and 3 way valve. 1 skimmer, 1 main drain, 2 returns, 2" plumbing, Hayward auto fill valve.

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Zero CYA???

    See if you can get the Palintest SP 315C kit as well as the Palintest SP 300 though the latter may only be available in the U.S. Palintest is generally available in Europe so hopefully available in Portugal.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    solarboy's Avatar
    Join Date
    Aug 2010
    Location
    Europe
    Posts
    337

    Re: Zero CYA???

    Thanks for that Richard, top of my shopping list.
    Self built 5500 gallon bare concrete (temporarily) pool with limestone coping, Pentair Swimmey 1/2 HP pump, Triton sand filter with DE, Simpool peristaltic muriatic acid pump with pH sensor and Monarch SWG. Home made solar heater with Pentair Compool control panel and 3 way valve. 1 skimmer, 1 main drain, 2 returns, 2" plumbing, Hayward auto fill valve.

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