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Thread: Raising Calcium Hardness w/ Cal.Hypo.?

  1. Back To Top    #1

    Join Date
    May 2011
    Location
    S.E. Mass.
    Posts
    15

    Raising Calcium Hardness w/ Cal.Hypo.?

    Hi,
    If I add just calcium hypochlorite to adjust my chlorine for awhile how much actual calcium does 1 lb. of Cal. Hypo. add to the water?
    I am going to use BBB but while my CH is low I thought I'd use up some Cal. Hypo. that I had left over.
    My calcium is low 140....and CYA is low...20....working on these slowly.
    Last test done with TF-100...

    CHL 4.0
    CC 0.0
    TC 4.0
    PH 7.5
    TA 110
    CH 140
    Temp 70
    CYA 15-20
    Thanks guys,
    Paul
    30 year old Gunite, 2008 got a new quartz finish.
    Freeform, approx 20,000 gal.
    Haywood 36 sf D.E Filter & 1 hp Hayward Pump
    BBB now was Triclor.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Raising Calcium Hardness w/ Cal.Hypo.?

    You can use the Pool Calculator to answer questions like this one. See the Effects of adding chemicals section near the bottom. With cal-hypo, for every 10 ppm of chlorine you add, you add about 7 ppm of calcium. Exactly how much calcium you add depends somewhat on the strength of the cal-hypo, which comes in several different concentrations.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    May 2011
    Location
    S.E. Mass.
    Posts
    15

    Re: Raising Calcium Hardness w/ Cal.Hypo.?

    Jason,
    Thankyou, I had not even noticed that calculator at the bottom ...
    So, if I use a case,(24), 1 lb bags of 65% calcium hypochlorite it will raise the CH 65PPM...!
    Wow, I had no idea these chemicals had such long term effects on water chemistry..
    How many other people have any Idea of what the pool store sells you is actually doing to your water...wow.
    Thanks again,
    Paul
    30 year old Gunite, 2008 got a new quartz finish.
    Freeform, approx 20,000 gal.
    Haywood 36 sf D.E Filter & 1 hp Hayward Pump
    BBB now was Triclor.

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