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Thread: Calcium addition and other effects

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    mikemass's Avatar
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    Jul 2013
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    Calcium addition and other effects

    As my last step in balancing my pool this season, I need to add 25 lbs of Calcium. How will this effect other chemistry? Is it going to do anything to the pH? Or anything I need to be aware of?
    25 + year pool owner. Current pool (going on 11th year) - 38K gallon in ground Gunite/White Plaster, Spillover Spa, Hayward Cartridge Filter, Hayward 450k BTU NG Heater, Hayward Goldline Aqua Logic control with T-Cell-15 Salt Water Cell, Dolphin Explorer.
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    Texas Splash's Avatar
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    Re: Calcium addition and other effects

    It should not change anything else, although it may give a cloudy appearance at first until the calcium increaser product you add has a chance to dissipate and mix thoroughly No need to worry if it does. It will go away on its own.

    Calcium hardness can be raised with calcium chloride or calcium chloride dihydrate. They are available in some areas as Peladow, Dowflake, Tetra Flake, or Tetra 94, often sold as a deicer by hardware stores, and some big box stores, in colder climates. Pool stores will carry either calcium chloride or calcium chloride dihydrate under a variety of names, including Hardness Plus, Balance Pak 300, Calcium Hardness Increaser, etc. Calcium products should be spread across the surface of the deep end of the pool.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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