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Thread: Opening for season - SLAMing - Adjust PH & CYA now?

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    Opening for season - SLAMing - Adjust PH & CYA now?

    Opened my pool a few days ago for the season. I started by slamming it with liquid bleach. Now wondering if that was correct to do first. Should I have adjusted my PH and CYA prior to starting the process? At what point can I test for PH and CYA, get an accurate reading, and adjust accordingly? Do I need to wait for FC to be at a certain level? Are both PH and CYA levels affected by the high chlorine used in the SLAM process. Thank you for the help.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

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    Richard320's Avatar
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    Re: Opening for season - SLAMing - Adjust PH & CYA now?

    How could you SLAM if you didn't know the CYA level so you could set the target FC level? Don't you mean you just hyperchlorinated your pool? We get sensitive about that term.

    Yes, you should have set the pH beforehand, because the pH test is affected when free chlorine is above 10. That's why it is listed as a prerequisite in the SLAM instructions. If at any point your FC is below 10, you can test pH and TA and use poolmath to calculate the dose to fix it. Then resume. If you're well above 10 FC, just keep going and deal with the pH when it's done.

    The CYA test isn't bothered much by chlorine levels. You can do it right now.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Opening for season - SLAMing - Adjust PH & CYA now?

    My bad. "Hyperchlorinated." Thanks for the help.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

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