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Thread: Which is correct shock level?

  1. Back To Top    #1

    Join Date
    May 2012
    Jackson, TN

    Which is correct shock level?

    The Pool Calculator says my shock level should be 17

    The CYA chart and everyone else says it's more like 22.

    Which one is it?

    I've been holding it at 22 -26 for the past 24 hours with the pump running 24/7 but still not passing the OCLT. I think it would have passed last night if it weren't for the fact that I had 10 kids who insisted they swim in it yesterday which probably set my progress back a little bit. My water is clearing up but still a little cloudy at the bottom of the deep end. Obviously I have to keep it at shock level until it passes the OCLT but once it does do I need to keep it at shock level until it's completely clear?
    In-ground, vinyl pool, 26,000 gals
    Hayward Sand Filter, Aquarite SWG, Hayward Ecostar Pump

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Which is correct shock level?

    They are both correct, the Pool School number is just more trouble free.
    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

  3. Back To Top    #3

    Re: Which is correct shock level?

    How big of a hurry are you in? Use to higher number to go faster. Remember that in shocking, you never want to drop below the level, so your minimum shock level is about 17, dose up to at least 22. I would not let kids go in at above 17, will burn nose and privates, IME. So yes, letting kids swim added some time to the process but sometimes you have to let them in the pool.

    To pass the test it must be clear. So keep going. Sand filters take longer, I read that you can add a bit of DE to help, but I do not know details of that.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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