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Thread: ph problems with SWG

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    ph problems with SWG

    Installed a SWG in December and have been having troubles maintaining pH. It just keeps creeping up.

    First a little history. I bought the house 2 years ago and hired a pool guy to maintain it. I simply didn't have the time and it was something easy to outsource. When other home improvement projects started tapering off, I took over the pool maintenance, but by then the damage had already been done. CYA levels were through the roof, well over 150.

    So after reading up on SWGs, decided I needed to have one. Installed it and drained the pool. I've been cautious on CyA though as I do not want to repeat the scenario where CYA is so high that I have to drain and refill.

    Water chemistry is approximately:
    FC - around 4ppm typically
    pH - typically 8+
    TA - 70-80
    CYA - 50
    Salt - 350ppm
    Borates - 50ppm

    So I'm guessing my CYA is too low? Based on this I'd say so - pool-school/water_balance_saltwater_generator
    Does it really need to be in the 60-80 range with the constant chlorine production from the SWG while the pump is running (6 hours per day during daylight hours)? My usual problem is I get the pH down to 7.5 with acid and then a week later it is back up to 8

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: ph problems with SWG

    It's common to have rising pH with a swcg. You can try lowering your TA to about 60 and raising your CYA up to 70. Raising the CYA up to 70 will allow you to turn the swcg down a bit which will in turn, not raise the pH quite as fast. Also lowering the TA will help the outgassing which raises the pH.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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