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Thread: CYA -what to believe?

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    CYA -what to believe?

    I have been using the methods here for approx. 3 years with pretty good success. I have been running a CYA level of about 35-40 and decided to bump it up a bit for the intese summer sun here in Mesa, AZ. Using my older Taylor test kit I read 0 levels even after adding 2.5 lbs. of CYA. I then took a water sample to Paddock Pools and they confirmed a 0 level. Then I took water samples to 3 nearby Leslies Pool Stores and all 3 read levels between 60 and 80! Then I ordered a TF-100 kit and it reads 0 CYA. All other parameters are good except CH which is over 1300. It's too hot to drain and fill so I may have to live with that until fall. Any ideas or suggestions would be appreciated.

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    JasonLion's Avatar
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    Re: CYA -what to believe?

    Welcome to TFP!

    That is a puzzler.

    Did you happen to notice what CYA test the Leslie's stores were using?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: CYA -what to believe?

    2.5 pounds of CYA in 10,000 gallons would be 30 ppm but in 20,000 gallons would only be 15 ppm so might not show up. What size is your pool? Your CYA may have dropped to near zero over the winter.
    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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    Re: CYA -what to believe?

    Pool is 13,760 gallons. I have another 2.5 lbs of CYA that I might dump i just to see if I get anything on the new test kit. Since I will probably be doing an aggressive backwashing schedule in an attempt to lower the CH, if CYA is high, I will be dropping it also. There is a local company here that does RO treatments but they have not responded to my free estimate request. Anyone have a ballpark figure on RO treatment vs complete drain and fill?

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    Re: CYA -what to believe?

    Well, just out of frustration I ran 2 more CYA tests before adding any more. I actually think I got the dot to disappear at about 50 or 60. I did the shake for 30, wait 30, shake 30, test method with the light coming from behind me. I will try again in a day or 2. Any input on my drain and fill vs RO treatment choice would still be appreciated!

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    JasonLion's Avatar
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    Re: CYA -what to believe?

    When doing the CYA test, if the water is cold, bring the water sample inside and let it warm up to room temperature first.

    RO prices vary from place to place. Typically they are at least somewhat competitive with a drain and refill using municipal water.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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