Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: PH is up .... why?

  1. Back To Top    #1
    TizMe's Avatar
    Join Date
    Aug 2007
    Location
    Covington, Georgia
    Posts
    920

    PH is up .... why?

    To make a long story short. Our water has been cloudy for the past few days. I had bought some dollar store bleach because we needed some and didnt want to drive all the way to walmart to get some reg clorox. I used it for a few days and it didnt seem to be working. We went yesterday and got some regular 6% bleach ( dollar store stuff didnt have a % on it anyway i was brushing vaccuming backwashing and it was staying cloudy. I can see the bottom of the pool and all but the water just isnt as crisp as it had been before the dollar store bleach was added. Our bleach consumption has been on an average of 2-4ppm each day. Last night I went ahead and shocked the pool and checked it this morning and no FC loss during the night ... so I guess thats a good thing Now our PH has shot up dramaticly to 8.2 or more.
    My question is , should I just add acid to reduce the PH and ignore the possible algae bloom since there was no FC last night and will high PH levels cause water to be cloudy ?

    I also added when I shocked the pool last night a little more bleach than I should have. I hate having part jugs of chlorine laying around!

    This mornings test results were

    FC 20 (no loss from last night)
    CC .5
    TA 100 ( Also up a little bit since last tested)
    CYA 50
    Water Temp 76

    Have been brushing twice a day and vacuuming in the evenings after work since its a more time consuming adventure !
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
    Helpful Links:
    Pool School,Pool Calculator,Cl/CYA Shock Chart,TF Test Kit
    Doing BBB and loving it!

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: PH is up .... why?

    Don't trust the PH test results when the FC level is that high. Wait till FC is 10 or lower and test the PH again. Most likely that is a false PH reading caused by the high FC level.

    Dollar store bleach is sometimes quite old and if so will have lost much of it's disinfecting chlorine over time. Chances are the low chlorine level allowed algae to get started. Shocking should take care of that easily because you caught it so soon. If it was the start of algae, it can take the filter several days to clean up the cloudiness.
    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
    TizMe's Avatar
    Join Date
    Aug 2007
    Location
    Covington, Georgia
    Posts
    920

    Re: PH is up .... why?

    Should I keep the FC at shock levels for a few days to be sure we got rid of the algae or just let it drop back to a normal limit ?
    Also is it ok to swim with FC levels that high ?
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
    Helpful Links:
    Pool School,Pool Calculator,Cl/CYA Shock Chart,TF Test Kit
    Doing BBB and loving it!

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: PH is up .... why?

    You didn't have any FC loss overnight so it is safe to let the FC level start drifting down.

    With CYA at 50 I wouldn't swim with FC above 16, but this is a very subjective decision. Many indoor public pools have an active disinfecting chlorine level that is far higher than what you have in your pool and people swim in them all the time.
    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

  5. Back To Top    #5
    TizMe's Avatar
    Join Date
    Aug 2007
    Location
    Covington, Georgia
    Posts
    920

    Re: PH is up .... why?

    Last night I shocked our pool because of a suspected algae bloom caused by stupidity on my part. This morning I checked the chlorine and there was no FC loss during the night remaining at 20ppm. Tonight I went to check levels and our ppm loss for the day was 7ppm from 20 to 13. I did the test twice to make sure. Is this an unusual amount to drop or is this within acceptable numbers . It wasnt overly sunny today, overcast with sun towards midday. We had 3 teenagers in the water for perhaps 2 hours and thats stretching it

    I have never noticed a drop like that before and I had thought a drop of 2-3 ppm was the accepted number?
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
    Helpful Links:
    Pool School,Pool Calculator,Cl/CYA Shock Chart,TF Test Kit
    Doing BBB and loving it!

  6. Back To Top    #6
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: PH is up .... why?

    The amount of chlorine you lose due to sunlight is a percentage of your starting chlorine level. Higher starting chlorine levels mean more chlorine lost. You lost less quite a bit less than 50%, which is doing really well for a CYA of 50.
    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

Posting Permissions

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