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Thread: Does bleach raise ph?

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    Join Date
    Jul 2010
    Reno, Nevada

    Does bleach raise ph?

    I've been using mostly Clorox bleach this season to chlorinate my pool. But it seems that every time I add bleach my ph goes up too. That means adding muriatic acid which I hate to do. Going to experiment with using Trichlor tablets for a while to see if my ph still goes up. TA is 110 and Calcium is 250. CYA is 30. So I've been adding nothing but bleach and muriatic acid. The pool is covered by a solar cover whenever we aren't using it.
    25K gal gunite pool with Auto Cover and Meyco mesh winter cover. Pump and filter in underground vault below level of returns. New Pebble Fina plaster in 7/2010.

  2. Back To Top    #2
    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Does bleach raise ph?

    Bleach is basically ph neutral. It will raise the ph slightly when added but as the chlorine get used up, it will drop back down. Some of the cheaper stuff, and the higher concentration stuff have more lye, which will raise ph a little...but again, in most cases, ph neutral (long term).

    How fast a ph rise are you seeing?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  3. Back To Top    #3

    Join Date
    Jul 2012
    Dumfries & Galloway, Scotland

    Re: Does bleach raise ph?

    Typical store bought bleach has a pH in the region of 12.5 and will increase pH usually slowly as TA will absorb the pH rises and depressions for the most part, TA of 110 is at the top of the comfort range, CH is fine and CYA is at the bottom Of the range.

    Are you adding a lot of bleach? For example have you been shocking recently or is their a high chlorine demand in your pool?

    Tri-Chlor is acidic, so will slowly lower pH and TA, but if you have some lying around you might as well use it up. In 25,000G it will take about 2kg for a CYA increase of 10 to the 40 mark, but check that math on the pool calculator which will make a better job of crunching the numbers.
    Stuart Murray
    Scotland UK

  4. Back To Top    #4

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    X-PertPool's Avatar
    Join Date
    Jun 2009
    Exeter, PA

    Re: Does bleach raise ph?

    Make sure you aren't testing as soon as you add bleach as that will make the pH test falsely high.
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    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

  5. Back To Top    #5

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Does bleach raise ph?

    With a TA of 110, then when you are using the pool (i.e. when the cover is off) the pH will rise from carbon dioxide outgassing. That can be lessened by not trying to lower the pH below 7.5 unless you intentionally want to lower the TA over time. A TA close to 120 is more appropriate when using Trichlor which is very acidic, but for bleach and chlorinating liquid and other hypochlorite sources of chlorine (e.g. Cal-Hypo and lithium hypochlorite), a TA of 80 or even lower is more appropriate.

    There is also some excess lye in bleach and chlorinating liquid, but Clorox bleach has some of the lowest amounts of excess lye of any so by itself should not be noticeable.
    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"

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