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Thread: lowering Ph before SLAM

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    lowering Ph before SLAM

    In a separate post, I was told to SLAM my pool. I have been reading every article I can find but I'm a little unclear on how to lower the PH first. The POOLMATH tells me how much muriatic acid to use, but where do I buy that? Are there different strengths? Can someone link me the info on how to lower the pH (where to pour the acid, how long it takes before I start to SLAM, etc.) Also, how do you know when you are done SLAMing? And before it is safe to swim in again? Also, my CYA (Intex swg) is reading at 85, is that too high?

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    Mod Squad woodyp's Avatar
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    Re: lowering Ph before SLAM

    Buy 31.45% which is also 20 baume at any pool or hardware store. Pour slowly in front of a return and wait half an hour. See Pool School on the THREE criteria for completing SLAM.
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    Re: lowering Ph before SLAM

    Quote Originally Posted by woodyp View Post
    Buy 31.45% which is also 20 baume at any pool or hardware store. Pour slowly in front of a return and wait half an hour. See Pool School on the THREE criteria for completing SLAM.
    My hubby went to two hardware store and could only find "Kemtek pool and spa care Muriatic Acid." I'm so dang confused I'm almost wanting to take the dang pool down. I thought my numbers were okay and I'm stressed about slamming, and my hubby is stressed about mixing the acid with bleach in the pool (I know they won't be mixed on their own but there is a warning on the acid not to mix it so he is freaked out) image.jpg

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    svenpup's Avatar
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    Re: lowering Ph before SLAM

    That stuff is fine. Make sure you select 29% muriatic acid in the pH row of PoolMath. While MA should be handled with respect, there is no issue putting it in the pool. I do it weekly.

    You should store MA away from bleach, as they violently react if they come into contact with each other undiluted.


    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: lowering Ph before SLAM

    It is telling me to add only 1.5 ounces...dang and we bought two gallons!

    Thank you so much, I am going to add it now and hopefully will be able to start the SLAM process in an hour. Does that sound about right?
    Approx 8,000 gallon AG Vinyl pool
    Intex SWG

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    svenpup's Avatar
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    Re: lowering Ph before SLAM

    1.5oz sounds low to me.

    Make sure you set up all the "Now" values in PoolMath including Size and TA.

    What is you starting pH and TA (I assume you have not added borates)?

    As an example given: 8000 gal pool, TA=70, Current pH =8, Target pH=7.2, Borates=0, 29%MA, you would need 18oz MA
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: lowering Ph before SLAM

    Quote Originally Posted by svenpup View Post
    1.5oz sounds low to me.

    Make sure you set up all the "Now" values in PoolMath including Size and TA.

    What is you starting pH and TA (I assume you have not added borates)?



    As an example given: 8000 gal pool, TA=70, Current pH =8, Target pH=7.2, Borates=0, 29%MA, you would need 18oz MA
    I didn’t realize you had to fill in ALL the categories if you are only adjusting one. Duh! Ok, now it says 10oz. I am CURRENTLY at TA=80, PH=7.8, Borates 0.
    Does 10oz sound better?
    Approx 8,000 gallon AG Vinyl pool
    Intex SWG

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    svenpup's Avatar
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    Re: lowering Ph before SLAM

    10 oz is correct for a target pH of 7.4

    If it were me I would target 7.2 (the low end of the range recommended for SLAM) since pH will rise during SLAM and you can't accurately measure pH while at FC > 10.

    Bleach is more effective at low pH so aiming lower initially will give you every advantage.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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