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Thread: Can i Test cya after pool is iat shock level

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    Question Can i Test cya after pool is iat shock level

    I forgot to test my cya before I started the shock treatment. Is it ok to test while the chlorine level is so high?
    Intex AG 2252 / 10421 Gallons / Vinyl liner
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    Mod Squad JVTrain's Avatar
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    Re: Can i Test cya after pool is iat shock level

    There should be no interference in the CYA test from high FC levels. How high are they?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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    Re: Can i Test cya after pool is iat shock level

    17 right now

    Intex AG 2252 / 10421 Gallons / Vinyl liner
    Pool Set up - May 2016
    2650 gal/hr Intex Krystal Clear Pump- Type B Filter
    Intex SWG
    TFTestkit / SpeedStir Magnetic Stirrer!!! / BBB method only

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    Re: Can i Test cya after pool is iat shock level

    The SLAM values require that you have to know the CYA so you will know how much chlorine to add. How did you figure your chlorine dosage?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Can i Test cya after pool is iat shock level

    Yeah I know. I didn't think about the rain we just had that overflowed my pool before I started. I just went with what I had as the value before the rain and having to drain some of the water off. It was at 35. I used the tfp Calc to get my shock level.

    Intex AG 2252 / 10421 Gallons / Vinyl liner
    Pool Set up - May 2016
    2650 gal/hr Intex Krystal Clear Pump- Type B Filter
    Intex SWG
    TFTestkit / SpeedStir Magnetic Stirrer!!! / BBB method only

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    EVChargeGuy's Avatar
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    Re: Can i Test cya after pool is iat shock level

    If your concern is the change in CYA because of rain, it should now be lower than before the rain. As long as that is the case @17ppm you should should be high of shock level but a quite CYA test will confirm
    IG Tear Drop, Dark Gray Gunite , 27,000 gallons -Age 50+-years, very old Hayward Split Egg Sand Filter with side mount Multi-port- Hayward SP2600VSP Pump- Hayward chlorine feed (not used since finding TFP) - Laars 315K BTU Oil heater- LoopLoc Safety cover- AquaBot RAPIDS 4WD- TF-100 Test Kit w/ Speedstir- 390 Gal Hot Springs Spa Envoy installed May 2017

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    Re: Can i Test cya after pool is iat shock level

    Unless you got literal FEET of rain then your CYA is not going to change enough to make a difference. If that 35 was recent then you don't need to retest. You should also treat your CYA as 40, due to the variability of the test it is a good idea to round up to the next highest unless it is very close to the 30 line.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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