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Thread: CYA chart from Pool school or Data from the Pool Calculator

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    CYA chart from Pool school or Data from the Pool Calculator

    Trying to work my way through the shock process. I have the TF-100 test kit and being working it for 26 hours. My FC has been holding steady last 4 hours, but I realized I might not be driving it high enough.

    I have been using the recommendation from the Pool Calculator ( set to Trouble Free Pool recommendations). If I compare it to the CYA chart, I realize that the CYA chart is higher than the calculator.

    For example, with a CYA of 50, the chart says shock target is 20 ppm, the Pool calculator recommends a shock level of 16.

    Have I been keeping the level too low?

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    Mod Squad jblizzle's Avatar
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    Re: CYA chart from Pool school or Data from the Pool Calcula

    Either value is fine ... the Pool School chart is just a little more aggressive.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: CYA chart from Pool school or Data from the Pool Calcula

    Quote Originally Posted by tmdustmd
    Trying to work my way through the shock process. I have the TF-100 test kit and being working it for 26 hours. My FC has been holding steady last 4 hours, but I realized I might not be driving it high enough.

    I have been using the recommendation from the Pool Calculator ( set to Trouble Free Pool recommendations). If I compare it to the CYA chart, I realize that the CYA chart is higher than the calculator.

    For example, with a CYA of 50, the chart says shock target is 20 ppm, the Pool calculator recommends a shock level of 16.

    Have I been keeping the level too low?
    When shocking how long do you keep it up. Say you are going for a target if 16..once you get it there how long to you keep it there?
    30 ft round above ground 54" deep, 2HP motor, large sand filter

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    Mod Squad jblizzle's Avatar
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    Re: CYA chart from Pool school or Data from the Pool Calcula

    Quote Originally Posted by chances
    When shocking how long do you keep it up. Say you are going for a target if 16..once you get it there how long to you keep it there?
    Are you asking for your own knowledge or to see if the OP is doing it correctly?

    Read the process in Pool School. You maintain shock level until you pass the 3 criteria to stop.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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