Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: Does High FC Throw Off pH Numbers?

  1. Back To Top    #1
    wjaneala's Avatar
    Join Date
    May 2015
    Location
    Cullman, AL
    Posts
    163

    Does High FC Throw Off pH Numbers?

    So, I decided to do a SLAM since it seems like I have algae creeping back every time I think it's gone. Since the other day when I ran the auto cleaner to get rid of what I thought was dirt/pollen on the entire surface of the pool, my deep end is now green. I really thought I had this beat, but I guess not. Anyway, I've raised my FC up to my shock level of 24, and it's holding right now. Just for kicks, I checked the pH, and it was at least 8.2. Is that just because of the shock level? Or do I have a bigger problem?

    FC 24
    CC .5
    CYA 60
    pH 8.2
    CH 200
    Wendy
    1980s 20x40 in-ground beast, 36K gallons, 4' - 8', vinyl liner, Sand Dollar sand filter, two skimmers, bottom drain, three returns
    TF-100 Test Kit

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

    Re: Does High FC Throw Off pH Numbers?

    Yes. The pH test is not accurate (reads a false high) when the FC > 10ppm.
    This is why the first step of the SLAM process is to lower the pH to 7.2-7.4
    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
    wjaneala's Avatar
    Join Date
    May 2015
    Location
    Cullman, AL
    Posts
    163

    Re: Does High FC Throw Off pH Numbers?

    Thanks, Jason. So here's an odd question..I'm doing the SLAM, maintaining the 24 FC right now. I've been brushing the cr*p out of the pool, but I can't reach the middle of the bottom of the deep end with my brush. I'd say there's a a good 18 inch perimeter around the bottom drain that I can't reach. Is that going to cause the SLAM not to work?
    Wendy
    1980s 20x40 in-ground beast, 36K gallons, 4' - 8', vinyl liner, Sand Dollar sand filter, two skimmers, bottom drain, three returns
    TF-100 Test Kit

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Does High FC Throw Off pH Numbers?

    It could make the SLAM take longer and/or use more chlorine. Brushing exposes the layers of algae to chlorine to kill it faster.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  5. Back To Top    #5
    wjaneala's Avatar
    Join Date
    May 2015
    Location
    Cullman, AL
    Posts
    163

    Re: Does High FC Throw Off pH Numbers?

    I'm going to try lying on the diving board and leaning over as far as I can to see if I can get to it. This should be funny.
    Wendy
    1980s 20x40 in-ground beast, 36K gallons, 4' - 8', vinyl liner, Sand Dollar sand filter, two skimmers, bottom drain, three returns
    TF-100 Test Kit

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Does High FC Throw Off pH Numbers?

    Sounds like you need a longer pole.
    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!

  7. Back To Top    #7

    Join Date
    Jul 2014
    Location
    Independence, KY
    Posts
    204

    Re: Does High FC Throw Off pH Numbers?

    Agreed that you need to get a longer pole. This will not only help with the slam, but with long term maintenance. You should brush your pool regularly, and if there is a large area you always miss, it might cause you some long term aggravation.
    IG W/Vinyl Liner Oval 18x40, 21K gal, Oval 3'-8'
    Pentair Intelliflo VS Pump, Sand Filter

  8. Back To Top    #8

    TFP Guide

    pabeader's Avatar
    Join Date
    May 2015
    Location
    Dallas Ga
    Posts
    4,064

    Re: Does High FC Throw Off pH Numbers?

    duck tape a broom on to the pole.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

  9. Back To Top    #9
    wjaneala's Avatar
    Join Date
    May 2015
    Location
    Cullman, AL
    Posts
    163

    Re: Does High FC Throw Off pH Numbers?

    You all can order your "I'm with Stupid" t-shirts now, with the fingers pointed directly at me. I thought I had my pole extended as far as it would go, but it was only stuck. I got a good extra two feet on it today. w00t! NOW the entire pool has been brushed.
    Wendy
    1980s 20x40 in-ground beast, 36K gallons, 4' - 8', vinyl liner, Sand Dollar sand filter, two skimmers, bottom drain, three returns
    TF-100 Test Kit

  10. Back To Top    #10
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Does High FC Throw Off pH Numbers?

    Nice! Problem solved.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

Posting Permissions

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