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Thread: Calcium hardness test. What does it measure?

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    Calcium hardness test. What does it measure?

    Hi All,
    Just curious what the calcium hardness test actually measures and what units it measures in, maybe ppm? I couldn't figure it out based on the instructions.

    PS no jokes that it measures "calcium hardness"
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Calcium hardness test. What does it measure?

    I believe it is ppm of Calcium Carbonate. See here.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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