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Thread: High FC and High pH

  1. Back To Top    #1

    Join Date
    Jul 2008
    Location
    Seacoast, NH
    Posts
    248

    High FC and High pH

    I know I have seen this answered on this site many times before, but I can't find it. Please forgive me asking a question addressed in other threads.

    My CC is usually zero. I hate it when it isn't. Yesterday the CC was < 0.5 and there was this yellow junk on the bottom of the deep end. When I brushed it, it made the water on the bottom of the deep end look like weak tea. The water also looked just the teeniest bit cloudy. It had been more than a couple of days since DH vacuumed (we have a deal, I deal with the chemicals and he does the vacuuming), so I didn't know if it was dirt or something growing. So, I decided to bring the chlorine up to shock levels and convinced DH to vacuum last night before the major heat wave hits today.

    Pool passed the over-night test and there's nothing on the bottom of the pool today. Water looks clear.

    Numbers as of now:
    FC 17.5
    CC< 0.5
    PH at least 8 (as high as K2006 goes)
    CYA 50 (I know it's low for SWG, working on it)

    Yesterday the pH was 7.8. Last night I added enough dry acid that the pH should have been brought down to 7.5. (I've been slowly adding borax for the first time. I haven't added any since Sat). I know I've read that high chlorine can cause messed up pH readings, but I can't remember if it causes false high or false low results. If it causes false low, I think I'm in trouble, but I don't know what caused it.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

  2. Back To Top    #2

    Join Date
    Jun 2010
    Location
    Glendale, CA
    Posts
    513

    Re: High FC and High pH

    false high
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

  3. Back To Top    #3

    Join Date
    Jul 2008
    Location
    Seacoast, NH
    Posts
    248

    Re: High FC and High pH

    Quote Originally Posted by lightingguy
    false high
    YAY! Thanks
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

  4. Back To Top    #4

    Re: High FC and High pH

    I've been testing my pH with FC @ 11.5-12 at time of testing. It seems to be accurate. My pH was 7.2 for a long time, I made a fountain and it goes up about 0.2/day. (~12hrs run time) I shouldn't say for sure though, I've only been running it for one day. I used left over powder last night, but tonight I'm picking up some muriatic acid. Before the fountain my pH seemed to be steady at 7.2-7.3.
    Aaron
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
    Powered by: TFP, PoolMath & TFTestkits

  5. Back To Top    #5
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: High FC and High pH

    As soon as you FC drops below 10, retest your pH.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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