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Thread: Add Cal-Hypo?

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    Join Date
    Feb 2009
    Location
    West Virginia
    Posts
    216

    Add Cal-Hypo?

    My question: If I need to shock when opening my pool AND I need to raise my CH level, would I be better off to use the store "shock" products? Cal-Hypo would do both, wouldnt it? Or would it not be fast enough? My opening CH level was 200 and I know it has to be at least 250. Started with 0 chlorine also.
    Full set of numbers:
    PH 7.5
    TA 100
    CYA 50
    CH 200
    TC 0

    Just wondering, have to make a trip to WalMart anyway! Thanks!
    WV Girl

    Custom "L" shape IG gunite pool, 36K gal., main drain, 2 skimmers, 3 returns, hayward heat pump, hayward 1.5hp pump with booster pump, ozonator, 4 cartridge filter.
    one dear hubby, two waterlogged kids, and lots of good times!

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
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    28,415

    Re: Add Cal-Hypo?

    That's not a bad plan. YOu could even use Cal Hypo as your chlorinating source until you got your CH up a little.

    Jason's calulator will give you the dosages if you choose that route. The money you save and the convenience you get may be offset a little by Cal hypo not dissolving as quickly as you'd like.

    That said, I have done exactly what you are contemplating and used it as my chlorinating source for about 30 days until my CH reached 250. I got a little calcium precipitate on the clear strainer basket lid but that was about the only issue.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
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    Re: Add Cal-Hypo?

    It would work but would take several pounds, the exact amount depending on whether it's 48%, 65%, or 73% cal hypo. The easiest way to figure is by how much you raise the FC. For every 10 ppm FC added by cal hypo you are also adding 7 ppm calcium so to get about a 50 ppm rise in the calcium you would need to add 70 ppm FC over time. If you are raising your FC 12 ppm over your base FC level each time you add cal hypo to shock you would need to shock about 6 times to raise your CH by about 50 ppm. It's not exact but it's close enough for government work!

  4. Back To Top    #4

    Join Date
    Feb 2009
    Location
    West Virginia
    Posts
    216

    Re: Add Cal-Hypo?

    Thanks for the quick responses, guys! Good to be reassured that I am slowly starting to learn this stuff! My hubby isnt totally convinced yet that I know what I am doing, but slowly I'm winning him over!
    WV Girl

    Custom "L" shape IG gunite pool, 36K gal., main drain, 2 skimmers, 3 returns, hayward heat pump, hayward 1.5hp pump with booster pump, ozonator, 4 cartridge filter.
    one dear hubby, two waterlogged kids, and lots of good times!

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