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Thread: pH level during SLAM

  1. Back To Top    #1

    Join Date
    Jun 2014
    Marietta, GA

    pH level during SLAM

    All year, my pH has been perfect. After no pump for 12 days, I got a bunch of algea. I am SLAMing now, but I noticed that my pH is around 8.0, maybe even higher (the color seemed a bit darker than the 8.0 mark). So should I wait until SLAM is done to worry about pH, or should I add some acid now?

    Also, I have never had to add any acid. What is the difference between muratic and dry, and where do I get either?
    27k gal, IG vinyl, Pentair Triton II Sand Filter, 1 HP Hayward Super Pump, Liner 3 yrs old, Intermatic PF1103T Timer w/ Freeze Protection, K-2006.

  2. Back To Top    #2
    cajuntwin's Avatar
    Join Date
    Aug 2016
    Kaplan, Louisiana

    Re: pH level during SLAM

    A little new here, but I believe your PH test will be inaccurate during SLAMing.
    Would be better to wait until finished SLAMing or drop FC to under 10 before testing.
    I've always used muratic and get mine at Lowe's at a pretty good price.
    Jerry -15 Year Pool owner, 20x30 inground gunite pool (25k gal), Polaris 360, Tagelus deluxe sand filter, Jandy Aquapure PLC1400 SWG, Taylor k-2006 test kit

  3. Back To Top    #3

    TFP Guide

    Join Date
    Jul 2015
    Central Valley CA

    Re: pH level during SLAM

    Did you by chance check the pH before starting the SLAM? pH reading will not be accurate at FC level above 10 ppm that's why the SLAM directions suggest getting it set before you start.

    If you did not check before and are only now noticing the level at 8.0 during the SLAM I would complete the SLAM wait for the FC to drop to 10ppm or lower then retest and adjust accordingly.

    If you did check before the start of the SLAM and that is when you got the 8.0 reading you could just use pool math to add the suggested amount of MA and assume you hit the target since you can't trust the test right now.

    MA can be found at most any big box hardware store either in the garden section or failing that the paint area.
    12,300 Gallon, IG PebbleFina, built Oct 2015, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac z4 control panel W/iAquaLink, 10GPDStenner for chlorine, 3GPD Stenner for MA, TF-100.

  4. Back To Top    #4
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: pH level during SLAM

    Did you lower PH to 7.2 to 7.5 before the slam? If so, don't worry. As mentioned the PH test is not valid when FC is above 10.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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