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Thread: High Calcium

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    High Calcium

    Does high calcium content (420+) cause any problems in an acrylic spa? My water is well balanced with a CSI of .01 according to the "Pool Calculater".

    385 Gallon Hawkeye Venus Hot Tub
    Pump 1-Pentair 2 Speed 4.2HP
    Pump 2-Pentair 1 Speed 3.0HP
    Balboa O3zone Chip Ozonator

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: High Calcium

    You should be OK so long as you keep the saturation index zero or a little below. I presume you must have a very low TA of around 50 ppm and a pH of around 7.5 or so. Just be careful to not let the pH creep up. Having 50 ppm Borates in the water can help slow down the rate of pH rise and prevent scaling.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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