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Thread: Bleach versus Cal-Hypo (cost)

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    Bleach versus Cal-Hypo (cost)

    Ok here I am again. I searched online and couldn't find anything definitive. I've been committed to doing BBB method but started wondering if all the bleach will add up to be a ton of $ in the end. Pool store sells Cal-Hypo at $83 for 25 pounds. She said that would last the rest of the season, through pool closing and possibly opening again next year. Concentrated bleach here runs $3 a gallon.

    I understand I'm asking for some math here. If you tell me how to calculate it I'd be happy to do them myself. I'm a little lost in that area after reading some posts online with all kinds of calculations regarding available chlorine, etc. Or if you could post a link to a thread where someone has broken this down. I found one but it was based on 6% bleach at $1 a gallon.

    (BTW, our current CH is 50 which is why I'm considering Cal-Hypo for the rest of this season at least...but not sure which is better or cheaper)
    18,000 gallon in-ground chlorine fiberglass pool with a hayward super pump vs and hayward sand filter (approximately 10 years old with new sand and some DE added June 2015)

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    Richard320's Avatar
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    Re: Bleach versus Cal-Hypo (cost)

    In a pool your size, 400 ounces (25 lbs) 73%Cal-hypo raises FC by 120. (Effects Of Adding Chemicals at the bottom of poolmath) That means it costs 83.00/120 or $0.692 per ppm.

    128 oz of 12.5% bleach is 6.9 FC. $3.00/6.9 = $0.435 per ppm.
    128 oz of 10% bleach is 5.6 Fc, so $.535
    121 oz (standard Clorox jug) of 8.25% bleach is 4.5 FC so $.667

    Bleach is cheaper. However, if you're going to buy Calcium Increaser, then it may cancel out the savings. 25 lbs of Cal-hypo will add 85 CH to your 18,000 gallon pool.
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    JoyfulNoise's Avatar
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    Re: Bleach versus Cal-Hypo (cost)

    Also remember that cal-hypo is often very slow to dissolve when you throw it in the pool. Since you have a fiberglass pool you'll want to add it and then brush A LOT to make sure the cal-hypo mixes and the solid granules don't just sit in one spot. By contrast, bleach poured over a fast moving return disperses very quickly and only needs a minimal amount of brushing to ensure dispersion.

    But yes, since your CH is low, you can certainly use cal-hypo. It's easier to carry than a jug of bleach. You just need to understand its affects on your pool water which is it will add calcium, something that only goes away with water exchanges.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    cowboycasey's Avatar
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    Re: Bleach versus Cal-Hypo (cost)

    Quote Originally Posted by Richard320 View Post
    In a pool your size, 400 ounces (25 lbs) 73%Cal-hypo raises FC by 120. (Effects Of Adding Chemicals at the bottom of poolmath) That means it costs 83.00/120 or $0.692 per ppm.

    128 oz of 12.5% bleach is 6.9 FC. $3.00/6.9 = $0.435 per ppm.
    128 oz of 10% bleach is 5.6 Fc, so $.535
    121 oz (standard Clorox jug) of 8.25% bleach is 4.5 FC so $.667

    Bleach is cheaper. However, if you're going to buy Calcium Increaser, then it may cancel out the savings. 25 lbs of Cal-hypo will add 85 CH to your 18,000 gallon pool.
    This also depends on the price of your bleach, we can get 10% here in OK for 2 dollars a gallon right now, bringing the price down to 0.357 cents per PPM
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    JoyfulNoise's Avatar
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    Re: Bleach versus Cal-Hypo (cost)

    We have a store here in Tucson that sells bulk liquid chlorine in refillable, 1 gallon jugs. They come in a 4-up secondary carrier (one time refundable deposit of $6). I don't remember the price off hand but it is a fair bit cheaper than the LC sold at pool stores in disposable gallons or the Clorox in the superstores. If you can find a place near you that supplies bulk-refillable LC, then you can move the price-point in favor of liquid bleach. And you get the benefit of nothing extra added except for a little excess salt and lye in bleach.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Bleach versus Cal-Hypo (cost)

    Thank you for the cost breakdown and advice. When I looked into it last year I was told (by a pool store) that liquid chlorine is not sold in Virginia. I can look into getting some from Dollar Tree, which is 6% I believe, but I remember reading that their bleach has been shelved for longer and has probably degraded a decent amount. Regardless, it appears even walmart bleach is a little cheaper than Cal-hypo unless you take the calcium into account.
    I appreciate the math help! I'll have to think on it.
    18,000 gallon in-ground chlorine fiberglass pool with a hayward super pump vs and hayward sand filter (approximately 10 years old with new sand and some DE added June 2015)

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