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Thread: Issue with PH going up due to SWG pool

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    divepool's Avatar
    Join Date
    Aug 2008
    St. Charles IL

    Issue with PH going up due to SWG pool

    Jasonlion, I have the same issue with PH going up due to SWG pool and I run my pump 24hrs a day using Pentair VF pump, set the gallons of pool and how many turnovers per day and it run my pump at 40% and I have the SWG set for 30/35% since I run two SWG's. My CYA is at 0 currently need to add cya achieve 60ppm. My water is always crystal clear but PH creep is a killer. Your saying I can keep PH creep to a minimum by using borate, what type and amount. My chemical cost is just buying muriatic acid and salt when needed during the season. Any help would be great


    FC 3
    PH 7.5 was at 7.8 added 2.5gal of acid to bring down.
    CYA 0 need to add 28lbs to increase to 60, filled with well water
    22x52 IG 56K gal 3.6' to 11.6' deep, TruTile w/Vinyl Liner IG pool w/ 12" wide safety ledge
    StaRite System 3 Cartridge filter 450sqft S8M450, Pentair IntelliFlo VF pump 3.2KW
    Hydronic in floor heat & StaRite SR400HD, Pro Logic PS16 w/2 40K Turbo cells.
    4 Hayward Colorlogic lights, Dolphin DL3002 Robotic cleaner
    Saint Charles, IL

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Issue with PH going up due to SWG pool

    Adding CYA is going make a huge difference. You will be able to turn down the SWG percentage significantly when CYA is up around 70 to 80, and that will mean a large reduction in the PH drift.

    Your TA level also plays a large role in how much PH drift you see. You didn't post a TA level, so I don't know where you are now. But try bringing TA down to 60 and see how that does.

    If you haven't already, read the section in Pool School on adjusting your levels for use with a SWG.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    In the Industry

    Join Date
    May 2011
    Woodslee, Ontario Canada

    Re: Issue with PH going up due to SWG pool

    I work in a pool store and I have found that borates really do help PH in a SWG pool. You will have a fair expense in achieving a 50ppm borate level, but once there IMHO it would be well worth in when calculating all the other benefits that borates offer. According to, You will need about 43 to 44 boxes of 20 Mule team borax, best price I've seen is $2.98 a box at Wal-mart. (Or you could stake a claim in Death Valley! lol) and about 12 Gallons of Muriatic Acid. Once Your pool is ready for the borax, I found that for every 4 boxes of Borax, You'll need approx 1 gallon of Acid (roughly). It would be wise to take a peek on article about adding Borates to your pool found in the Forum so-you-want-to-add-borates-to-your-pool-why-and-how-t4921.html. As always, enjoy your pool!
    14X28 inground Vinyl
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