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Thread: Calcium Hardness

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    Join Date
    Jul 2015
    Location
    Clearwater, FL
    Posts
    83

    Calcium Hardness

    Just wondering if someone could explain the rationale behind the revised suggested CH levels for pools using SWGs.
    Thanks.
    16K gallon IG exposed aggregate pool with Aquarite SWG T15 cell, Hayward C1750 filter, EcoStar SP3400VSP pump, H400FD pool/spa heater, Polaris PB4-60 booster pump, 280 pressure cleaner, Hayward Super II spa pump and Air Supply Silencer spa blower

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    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,580

    Re: Calcium Hardness

    Easy-peasy - many plaster pool owners find that their pools drift up in pH especially those that use SWG's. There were lots of threads this season with people asking why that was the case and, when they were instructed to lower their TA to find the right level, they were a bit reticent because the TA that gave them stable pH was a bit lower then the recommended levels. Fearing a CSI that was too negative, they also asked if that was ok. The answer was to raise the CH to compensate for the lower TA and more negative CSI. So many asked why the TA was set so high and CH set low if they were allowed to go outside the range and many felt a bit of annoyance that they did not know they could go outside the levels. So, at the end of the day, the CH levels were revised (and the TA levels too) to give people more flexibility in finding a pH sweet-spot while still keeping the CSI in the proper range. If your CH levels are a bit outside the Recommended Values (heck, my CH is 750ppm and I'm all good), that's ok as long as your CSI is properly balanced.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  3. Back To Top    #3

    Join Date
    Jul 2015
    Location
    Clearwater, FL
    Posts
    83

    Re: Calcium Hardness

    Thanks. Plaster is just 6 months old, so I"m not expecting stable pH yet. CSI is always close to zero.
    16K gallon IG exposed aggregate pool with Aquarite SWG T15 cell, Hayward C1750 filter, EcoStar SP3400VSP pump, H400FD pool/spa heater, Polaris PB4-60 booster pump, 280 pressure cleaner, Hayward Super II spa pump and Air Supply Silencer spa blower

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