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Thread: more questions about Alkalinity

  1. Back To Top    #1

    Join Date
    Mar 2015

    more questions about Alkalinity

    I have High alkalinity both in the pool and source water and currently the pool TA is at 325 ppm.
    I have learned that High TA can effect the chlorines ability for disinfection purposes. I have what appear to be algae showing up in the grout lines in part of the shallow end with most of the bather load,could that be a side affect of the High TA, and what would you suggest I do to eliminate that problem The FC is kept at a 3.0
    pool 200,000 gals., Indoor,inground, pool is tiled. Filters are DE with 16- 60x30 filters, filtering from both sides. Pool is located in Garland, Utah and was constructed in 1982. The circulation sys. is 24/7@ 600 gpm, as well as the air handler. The pool is owned by a school district and is used for class,as well as swimming sports, and opened to the public to. I use a BECSys5 chemical controller and taylor test kits K-2005, and k-1518

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

    Re: more questions about Alkalinity

    High TA can affect your risk for calcium scaling and metal stains, but it shouldn't have any direct effect on getting algae. Indirectly it could push the PH way out of range, while if extreme enough could reduce the effectiveness of chlorine, but PH has to be way off before that happens.

    Algae problems almost entirely revolve around the FC to CYA ratio. You didn't mention what your CYA level was. If CYA is zero, FC at 3 is more than sufficient. But as CYA comes up you soon get to the point where higher FC levels are required to prevent algae.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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