Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Testing Ph while shocking for algae.

  1. Back To Top    #1

    Testing Ph while shocking for algae.

    Could you tell me will a high chlorine level effect Ph testing? I am shocking for algae and am wondering if I should test the Ph levels while keeping up my chlorine up to shock level. Thanks for the help, Cannwmor
    20,000 gal. IG pool/ 400 gal. spa combo, unpainted plaster; Hayward Pro Series sand filter; Whisperflow 1.5 hp pump; Pentair Minimax pool & spa heater; Save-T Cover II Automated pool cover; Maytronic Dolphin; Dragonfly pool skimmer; Baquacil.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Testing Ph while shocking for algae.

    Welcome to TFP!

    Generally you shouldn't test PH while shocking. The PH test is reliable up to an FC level of 10, usable but not perfect from about FC 10 to 18, and useless at FC levels above that.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Testing Ph while shocking for algae.

    Thank you for your quick reply. Very helpful.
    20,000 gal. IG pool/ 400 gal. spa combo, unpainted plaster; Hayward Pro Series sand filter; Whisperflow 1.5 hp pump; Pentair Minimax pool & spa heater; Save-T Cover II Automated pool cover; Maytronic Dolphin; Dragonfly pool skimmer; Baquacil.

  4. Back To Top    #4
    BoDarville's Avatar
    Join Date
    Jun 2012
    Location
    DFW, Texas
    Posts
    3,840

    Re: Testing Ph while shocking for algae.

    cannwmor:

    Next time you have to shock, I would lower the pH to around 7.2 before you begin the shock process. Chlorine is more aggressive as a sanitizer at a lower pH. Don't overdo the pH adjustment, though...7.2 is a good target, but make sure you do not go below 7.0 under any circumstances.

    Once you begin the shock process, do not bother testing the pH for the reasons Jason stated.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •