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Thread: I need a refresher on bleach calculations

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    I need a refresher on bleach calculations

    This is lame, but I need a refresher on how to calculate and normalize the prices for different bleach concentrations and volumes. I did a board search, but I did not have any luck.

    For example, I can get 1 gal of 10% liquid chlorine at Orchard Supply for $3.25.
    And I can get 1.42 gal of 6% liquid chlorine at Target for $2.29

    Can you show how you do the calculations for me?

    Thanks!

    Titanium
    24,000 gallon inground freeform pool/spa circa 1983 (113 ft perimeter, 625 sq ft) with 350 gallon attached spill-over spa
    2007 2 HP, three-phase Hayward TriStar pump which is powered by an Ikeric VS-200 variable speed drive system
    1983 Laars XE Pool/Spa Heater Type ES 400,000 BTU, 1998 Hayward Super Star-Clear C-4000 cartridge filter (400 sq ft, 4 separate cartridges)
    1998 Polaris 380 pressure-side cleaner w/ 3/4 HP booster pump
    One skimmer :( and one PoolSkim :), One Supervision Galaxy LED pool lamp, Second story solar panels
    Hayward/GoldLine AquaLogic PS4 (replaced 1983 vintage dual circuit Intermatic timer)

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    Mod Squad JohnT's Avatar
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    What I do is figure out how much NaOCl there is in each jug. The Orchard Supply chlorine contains 12.8oz(10% of 128oz) NaOCl for $3.25, so it's 25.4 cents per ounce of NaOCl. Target bleach contains 10.9oz (6% of 1.42gal) NaOCl for $2.29, so it's 21 cents per ounce of NaOCl.
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    I've yet to find anything that beats the 96 ounce Great Value jugs of 6% at Walmart. 99 cents per bottle.
    6% of 96 = 5.76 ounces of NaOCl @ 17.19 cents per ounce.

    They sell a much larger bottle for $2.28, but it contains less than the amount in 2 of the smaller bottles (for a total of $1.98 ) so it's cheaper per ounce in the smaller bottles.
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    Mod Squad JohnT's Avatar
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    Quote Originally Posted by HarryH3
    I've yet to find anything that beats the 96 ounce Great Value jugs of 6% at Walmart. 99 cents per bottle.
    6% of 96 = 5.76 ounces of NaOCl @ 17.19 cents per ounce.

    They sell a much larger bottle for $2.28, but it contains less than the amount in 2 of the smaller bottles (for a total of $1.98 ) so it's cheaper per ounce in the smaller bottles.
    I've never seen the small bottles for 99cents. They are a decent amount more expensive than the big ones (per ounce) at every store I've been in. $1.28 is the normal price here.
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    The Walmart here has a lot of products that cost less per ounce in the smaller size. It doesn't make sense, but most people probably just grab the larger package, assuming that it's the better deal.

    I like using the smaller jugs anyway, as my pool takes right at 3 quarts per day, so I don't have to measure. I just pour the whole jug in.
    26,000 Gallon Gunnite IGP
    2 HP Challenger High Head Pump
    60sf Nautilus DE filter
    Polaris 280

  6. Back To Top    #6

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    Thanks for the help.

    I'll start having my wife pick up some generic Target bleach when she is there. I swear she goes to Target at least 3 times per week anyway.

    Titanium
    24,000 gallon inground freeform pool/spa circa 1983 (113 ft perimeter, 625 sq ft) with 350 gallon attached spill-over spa
    2007 2 HP, three-phase Hayward TriStar pump which is powered by an Ikeric VS-200 variable speed drive system
    1983 Laars XE Pool/Spa Heater Type ES 400,000 BTU, 1998 Hayward Super Star-Clear C-4000 cartridge filter (400 sq ft, 4 separate cartridges)
    1998 Polaris 380 pressure-side cleaner w/ 3/4 HP booster pump
    One skimmer :( and one PoolSkim :), One Supervision Galaxy LED pool lamp, Second story solar panels
    Hayward/GoldLine AquaLogic PS4 (replaced 1983 vintage dual circuit Intermatic timer)

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    sammm's Avatar
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    I've compared the prices on the shelfs at Walmart between the 2 size bottles. I think they show cost per ounce and I think they are the same price per oz.
    WetEdge Satin Matrix, 16K gallon, Pentair NSP-60 DE filter, Pac Fab Challenger, 2HP pump, BBB, Polaris 360

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    The tags on bleach at my Walmart don't list the price per ounce, but 99 cents for 96 ounces is a better deal than 176 ounces for $2.28...
    26,000 Gallon Gunnite IGP
    2 HP Challenger High Head Pump
    60sf Nautilus DE filter
    Polaris 280

  9. Back To Top    #9

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    HarryH3 are you in Dallas? Here in Houston the 96 oz bottles are $1.28 and the 176 oz are $2.38 so they are the better buy even though its a little less volume than two 96oz.
    36,000 gallon IG Gunite (40 x 20), 1.5 HP Hayward pump, Pentair Nautilus NS-48 DE filter, 2 skimmers, 12 - (2 x 20) Fafco Solar Panels (Goldline controller not hooked up yet), Hayward Swimpure Plus SWG, Blue Pearl Robot cleaner. New Dr. Wellness X-12 standalone Lifestyle Spa.

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