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Thread: What's best

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    DeathB4Me's Avatar
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    What's best

    Which is cheaper? Shock (Cal-Hypo) or Regular bleach.
    I've been trying to figure this out but i never get to it, and also which is best for my pool
    21K gal, Pentair Cartridge filter, IG pool, Concrete, 2.5hp Pentair pump.

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    Re: What's best

    First, it depends on where you are now. Can you get a full test for us? If you have high CH, you don't want cal-hypo regardless of cost. If you have low CH then you can evaluate cal-hypo vs bleach plus calcium increaser costs.

    You can play with the pool calculator to find out what the cost is for whatever units of those are actually comparable. Like, for your size pool, if 1 lb of cal-hypo adds X ppm of chlorine and Y ppm of CH, then how much will it cost for the correct amount of bleach to give your pool x ppm of chlorine and how much will it cost for the correct amount of calcium increaser to give you Y ppm of CH.

    But, you still first need to know if cal-hypo is even something you need to consider in your pool. Maybe you can't use it regardless.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: What's best

    Most likely bleach - especially in Vegas.

    Cal-Hypo adds calcium to the water as well as chlorine. Check your Calcium Hardness level before using Cal-Hypo. Our pool got up to 1200ppm CH and was cloudy for a month before we really got a handle on what was going on.

    Unless your CH level is below range for your plaster pool I'd avoid it - especially over the long term with a pool that's open all year long.

    (Basically what anon said )
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Re: What's best

    Does Cal-hypo also contain CYA? I'd like to know if cal-hypo is an option for those of us with low CH levels but high CYA levels.
    20'6" X 38'6" (609 sqft)
    22,500 gal gunite/plaster IGP
    DE filter, Jandy 2HP pump, Nature2 Sanitizer (removed cartridge!)
    Raypak 39.9K BTU gas heater
    2 ColorLogic lights, Maytronics Dolphin pool cleaner

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    Re: What's best

    Quote Originally Posted by tim_pool_newbie
    Does Cal-hypo also contain CYA? I'd like to know if cal-hypo is an option for those of us with low CH levels but high CYA levels.
    No CYA. It only adds CH and FC.

    So, yes, if you have low CH and high CYA it MAY be an option. But really, if you have really low CH it may take so long to add CH this way that you'd be better off adding some calcium increaser to get to the bottom of the range and then using the cal-hypo for chlorine for awhile.

    I had to do that earlier this year, I needed CYA, needed CH, couldn't get both up fast enough with both pucks and cal-hypo so I had to use some calcium increaser.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    DeathB4Me's Avatar
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    Re: What's best

    I think i'll stick with the shock since i have never got any problems before.
    Thank you though.
    21K gal, Pentair Cartridge filter, IG pool, Concrete, 2.5hp Pentair pump.

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    Re: What's best

    Quote Originally Posted by DeathB4Me
    I think i'll stick with the shock since i have never got any problems before.
    Thank you though.
    Whoa! How do you KNOW that it is OK? You have to know what your CH is now, and what the tap water will add to the pool over time.

    Someone just said that in Las Vegas you probably don't want to use that. Do you understand what he knows about Las Vegas that suggests that CH levels may be high there or tend to climb too high as time goes on?

    And, most importantly, you never got an answer on cost. We only looked at whether cal-hypo was actually a good option. (possibly not, given your location, but test data would answer that.)

    The answer on cal-hypo cost is that if you are getting it in pre-packaged 1 lb bags it will probably be more expensive than bleach. If you are getting the 100 lb bucket it might be the same for the same amount of chlorine.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: What's best

    Obviously this is a bit broad, but here's a sense of what water hardness looks like around the country

    http://www.qualitywatertreatment.com/ci ... _guide.htm
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    dmanb2b's Avatar
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    Re: What's best

    Quote Originally Posted by DeathB4Me
    I think i'll stick with the shock since i have never got any problems before.
    Thank you though.

    Shock is a process, not a product. Cal-hypo is a source of chlorine as is sodium hypochlorite (aka bleach aka liquid chlorine, aka liquid "shock")

    You should read Pool school, before you end up with calcium scaling.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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