Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: PH Accuracy with Shock Level Chlorine

  1. Back To Top    #1
    mickey4paws's Avatar
    Join Date
    Apr 2009
    Location
    S.E. MI
    Posts
    562

    PH Accuracy with Shock Level Chlorine

    We just finished the shock process a couple days ago and FC is 17, CC 0, PH 7.3, TA 130, CYA 60.

    I read that when chlorine is high that PH testing is inaccurate. Just wondering if that's true or not, and should I be adding Borax or Soda Ash to increase the PH, or should I wait for chlorine to go down to normal range? Also, my TA is high so not sure if I should adjust that now, or wait on doing that.

    Thanks!
    IG 12' x 39' - 20k Gallons - Vinyl Lined - StaRite Cristal-Flo II 26" Sand Filter - Hayward SuperPump 1 hp - Dolphin Dynamic autocleaner - Lochinvar Energyrite gas heater - Aqua Rite SWCG T-15 - TF100 Test Kit - Skimlite Duallly 9016 pole (great pole)

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: PH Accuracy with Shock Level Chlorine

    It is true, pH is artificially high when FC greater than 10ppm
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: PH Accuracy with Shock Level Chlorine

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  4. Back To Top    #4
    mickey4paws's Avatar
    Join Date
    Apr 2009
    Location
    S.E. MI
    Posts
    562

    Re: PH Accuracy with Shock Level Chlorine

    Thanks so much for the replies and the link. This morning FC is 14.5, CC 0, and CYA 60 (was late for work so I haven't done a full test yet). PH is reading at 7.4. Since FC is higher than 10, I wonder if my PH is really lower than it's reading.

    Once the chlorine comes down to normal range, I'll be turning on the SWG, which will probably make the PH go up anyway.

    Would you guys suggest just leaving PH alone for now?
    IG 12' x 39' - 20k Gallons - Vinyl Lined - StaRite Cristal-Flo II 26" Sand Filter - Hayward SuperPump 1 hp - Dolphin Dynamic autocleaner - Lochinvar Energyrite gas heater - Aqua Rite SWCG T-15 - TF100 Test Kit - Skimlite Duallly 9016 pole (great pole)

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: PH Accuracy with Shock Level Chlorine

    Yes, leave it alone for now. But do retest PH as soon as the FC level comes down.
    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

  6. Back To Top    #6
    mickey4paws's Avatar
    Join Date
    Apr 2009
    Location
    S.E. MI
    Posts
    562

    Re: PH Accuracy with Shock Level Chlorine

    Ok, thanks Jason

    I do have one last question, since it might be a few days to get the chlorine down, would it be ok to run the heater while the FC is still high? I really want to heat up the pool. Water temp this morning was only 70, and it's not supposed to be very hot here for the next week or so. I'd have to run the heater for a good 10 hours or so and I'm not sure if the high chlorine might be bad for it. I'd imagine short term it wouldn't be, but just want to make sure.
    IG 12' x 39' - 20k Gallons - Vinyl Lined - StaRite Cristal-Flo II 26" Sand Filter - Hayward SuperPump 1 hp - Dolphin Dynamic autocleaner - Lochinvar Energyrite gas heater - Aqua Rite SWCG T-15 - TF100 Test Kit - Skimlite Duallly 9016 pole (great pole)

  7. Back To Top    #7
    bmann71's Avatar
    Join Date
    Aug 2007
    Location
    Washington, Indiana
    Posts
    55

    Re: PH Accuracy with Shock Level Chlorine

    I may be totally screwed up but I'm pretty sure your water is going thru your heater regardless if the heater is on or not so I'm not sure what a high FC reading would matter.
    Ponduke
    20,000 gal/ Fiberglass IG/ Sta-rite s7m120 cartridge filter/Sta-rite SR400NA 400,000 btu heater/Polaris 360 Cleaner/K-2006 Test Kit
    poolcalculator
    Pool School

  8. Back To Top    #8
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: PH Accuracy with Shock Level Chlorine

    Running the heater is fine.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  9. Back To Top    #9
    mickey4paws's Avatar
    Join Date
    Apr 2009
    Location
    S.E. MI
    Posts
    562

    Re: PH Accuracy with Shock Level Chlorine

    Thanks, Jason! Bmann71, good point! I was wondering the same thing but since I know zip about heaters, I figured there must be more to it
    IG 12' x 39' - 20k Gallons - Vinyl Lined - StaRite Cristal-Flo II 26" Sand Filter - Hayward SuperPump 1 hp - Dolphin Dynamic autocleaner - Lochinvar Energyrite gas heater - Aqua Rite SWCG T-15 - TF100 Test Kit - Skimlite Duallly 9016 pole (great pole)

Posting Permissions

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