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Thread: Cal-Hypo

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    Join Date
    Aug 2007
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    NC
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    Cal-Hypo

    I've been doing BBB for the last year or so and the pool is great. But, i'm getting tired of lugging large jugs of 6% bleach from Walmart, so was thinking about a more convenient alternative. The local chemical supply has 68% cal-hypo. I calculate that it will cost me about two-thirds what it costs for bleach if I buy a 100 lb bucket of cal-hypo. However, I read in pool school that this will result in too high CH after a while.
    So, given that I have rather low CH now (vinyl pool liner, so I haven't been concerned about it), seems like i could use cal-hypo until my CH gets up to 300 or so, and then go back to bleach.
    Is this a reasonable plan?
    20,000 gal in-ground, vinyl liner, Hayward DE-3600 filter, Polaris 380, Purex Triton valve 27-1141. North Carolina

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    frustratedpoolmom's Avatar
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    May 2007
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    Re: Cal-Hypo

    Sure. Just keep your PH below 7.8 and it shouldn't be a problem.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Cal-Hypo

    I use cal-hypo indefinitely and my ch has not increased to high levels yet, this is what I primarily use to "shock" pools. Although if you really love BBB and you are willing to shop at a pool store why not go with liquid chlorine it's essentially just a stronger version of bleach about 15%, it doesn't store well though because it loses it's potency
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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    JasonLion's Avatar
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    Re: Cal-Hypo

    In 20,000 gallons, 100 lbs of cal-hypo will raise CH by about 270. If your fill water CH levels are low and you backwash your filter regularly that can work for quite a while. But do keep an eye on the CH levels, calcium scale can cause some serious problems.

    Large quantities of cal-hypo can be extremely dangerous if you ever have a fire. The odds of having a problem are very low, but still, I am not sure I would ever want to have 100 lbs in my house. You also need to be sure to keep it cool (room temperature cool, not refrigerated or anything like that). It can degrade at high temperatures, especially when stored for a long time.
    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

  5. Back To Top    #5

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    Re: Cal-Hypo

    Quote Originally Posted by JasonLion
    In 20,000 gallons, 100 lbs of cal-hypo will raise CH by about 270. If your fill water CH levels are low and you backwash your filter regularly that can work for quite a while. But do keep an eye on the CH levels, calcium scale can cause some serious problems.

    Large quantities of cal-hypo can be extremely dangerous if you ever have a fire. The odds of having a problem are very low, but still, I am not sure I would ever want to have 100 lbs in my house. You also need to be sure to keep it cool (room temperature cool, not refrigerated or anything like that). It can degrade at high temperatures, especially when stored for a long time.
    Fire hazard?! You mean I shouldn't be storing my 50lb barrels of cal-hypo on top of my furnace? lol
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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