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Thread: Is sodium hydroxide in bleach normal/ok to use in pool?

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    Join Date
    Aug 2012
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    Melbourne, Australia
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    Is sodium hydroxide in bleach normal/ok to use in pool?

    Hi guys.

    Found some bleach at ALDI supermarket - extremely cheap but only 4% strength sodium hypochlorite. that's ok...

    But It also says in the active ingredients it has sodium hydroxide 9%.

    Is the sodium hydroxide OK to use in pool?

    I am shocking at the moment and can't get the better 13% liquid chlorine...
    13,000 gallon; sand filter; inground; fibreglass; pump not sure yet (need to check); Installed over 12 months ago.

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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    Cheap bleaches such as these are not as good as 6% Wall-Mart or 16% Supply but do the job ok, the additional Sodium Hydroxide or "lye" will have a slightly pH+ effect, but not much really. You don't have any real concerns about using it.

    Regards
    Stu
    Stuart Murray
    Scotland UK
    UK NPPOC

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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    Thanks stu...

    It's sunday morning here and I am shocking and can't pick up some 13% till tomorrow.

    I'll just get some cheap stuff to keep the shock process happening...

    Cheers.
    13,000 gallon; sand filter; inground; fibreglass; pump not sure yet (need to check); Installed over 12 months ago.

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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    Are you sure it says 9% sodium hydroxide and not 0.9% (which is still high -- good chlorinating liquid has 0.25% and Clorox bleach is < 0.1%)? If it's truly that high DO NOT USE IT. It will significantly raise the pH and require you to add a lot of acid. If it were truly 9% sodium hydroxide, then it would require about 30 fluid ounces (almost a quart) of full-strength Muriatic Acid (31.45% Hydrochloric Acid) for every gallon of bleach that you use!
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  5. Back To Top    #5

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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    I don't think the peroxide level quoted is correct, I've used Aldi bleach here in the UK many a time for poolside cleaning, washing it into the pool afterwards without any change in pH.
    Stuart Murray
    Scotland UK
    UK NPPOC

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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    Oops sorry I got it wrong it says 9g / litre which is 0.9%

    I will use it this once until I get some liquid chlorine tomorrow.
    13,000 gallon; sand filter; inground; fibreglass; pump not sure yet (need to check); Installed over 12 months ago.

  7. Back To Top    #7

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    Aug 2014
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    VA Beach VA
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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    Where do you get the 16% bleach? I normally use the 8.25% from Kroger or WalMart, but was looking at the bleach from Home Depot, which does have <1% Soldium Hydroxide (which is how I found this thread.

    I finally learned to NOT use Dollar Tree Bleach, after way too many $$ spent on basically water
    27,000 gallons plaster in ground with Hayward Sand Filter. The pool is older but was repainted this year.

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    New Orleans, LA
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    Re: Is sodium hydroxide in bleach normal/ok to use in pool?

    Quote Originally Posted by bzbmom View Post
    Where do you get the 16% bleach?
    The OP is in Australia. I'd be interested to know if any U.S. states allow retail sale of 16% bleach.

    Some states allow up to 12.5%, some (like mine) cap it at 10%. There are other states still of which I have no idea.
    Intex 16' x 8' x 42" Prism Frame AGP, vinyl liner, 3,300 gal, opened 5/28/2017. Intex Krystal Clear Model 637R Filter Pump. Cartridge filter (Size A). 6-way HTH testing kit.

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