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

Thread: Opening Inground Pool - CYA Level Low

  1. Back To Top    #1
    Sastocky's Avatar
    Join Date
    Mar 2013
    Location
    Jackson, Ohio
    Posts
    22

    Opening Inground Pool - CYA Level Low

    I am opening my pool today, *YAY!*, and tested CYA at <10. CYA was in range when closed.

    Does the CYA stay fairly homogeneous or do I need to circulate for a while prior to testing?

    Basically...start adding CYA or let circulate and retest tomorrow?
    Southern Ohio, 18'x36', 8'x3' deep, Vinyl, Hayward 1hp Super Pump, Hayward Sand Filter, Hayward AquaRite 25k SWG, 5-3'x8' Solar Panels, Hayward AquaSolar, Aqua Pro 137k Heat Pump

    Taylor K-2006, Taylor K-1766, Taylor SpeedStir, hth 6-Way with OTO

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Opening Inground Pool - CYA Level Low

    Circulate, then retest.

    Rule of thumb: always let the water mix about an hour before testing.
    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!

  3. Back To Top    #3
    Sastocky's Avatar
    Join Date
    Mar 2013
    Location
    Jackson, Ohio
    Posts
    22

    Re: Opening Inground Pool - CYA Level Low

    It mixed for 2 hours prior to testing.
    pH 8.0
    FC 0
    Southern Ohio, 18'x36', 8'x3' deep, Vinyl, Hayward 1hp Super Pump, Hayward Sand Filter, Hayward AquaRite 25k SWG, 5-3'x8' Solar Panels, Hayward AquaSolar, Aqua Pro 137k Heat Pump

    Taylor K-2006, Taylor K-1766, Taylor SpeedStir, hth 6-Way with OTO

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Opening Inground Pool - CYA Level Low

    Quote Originally Posted by Sastocky View Post
    It mixed for 2 hours prior to testing.
    pH 8.0
    FC 0
    Then it's pretty easy to get things straightened out.
    1) Add acid to lower pH to 7.4ish.
    2) Add CYA granules to raise CYA to 30ish. You can do this immediately after adding acid. Pay attention to the methods described in Recommended Pool Chemicals.
    3) Half an hour after adding the acid, add the bleach you want. If the water is clear and the current CYA is 10ish, target 3FC. If it's green, target 10. Once some of that CYA dissolves, target 12. But that's all covered in the SLAM article.
    4) When you have clear water and the CYA you added has had a week to dissolve, recheck CYA and raise it some more if necessary. You'll need to raise you target FC then, too.
    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!

  5. Back To Top    #5
    Sastocky's Avatar
    Join Date
    Mar 2013
    Location
    Jackson, Ohio
    Posts
    22

    Re: Opening Inground Pool - CYA Level Low

    Just read your reply but had already completed similar steps.

    I was just curious if the CYA settles out or stays homogeneous.

    I'm very surprised if it is this low as I do not drain my pool at all before winterizing, but I do have to pump quite a bit out when starting up. I've never had it drop that low.
    Southern Ohio, 18'x36', 8'x3' deep, Vinyl, Hayward 1hp Super Pump, Hayward Sand Filter, Hayward AquaRite 25k SWG, 5-3'x8' Solar Panels, Hayward AquaSolar, Aqua Pro 137k Heat Pump

    Taylor K-2006, Taylor K-1766, Taylor SpeedStir, hth 6-Way with OTO

  6. Back To Top    #6
    Sastocky's Avatar
    Join Date
    Mar 2013
    Location
    Jackson, Ohio
    Posts
    22

    Re: Opening Inground Pool - CYA Level Low

    Thanks for the advice! I'm amazed how many people you all help on here. Truly amazing.
    Southern Ohio, 18'x36', 8'x3' deep, Vinyl, Hayward 1hp Super Pump, Hayward Sand Filter, Hayward AquaRite 25k SWG, 5-3'x8' Solar Panels, Hayward AquaSolar, Aqua Pro 137k Heat Pump

    Taylor K-2006, Taylor K-1766, Taylor SpeedStir, hth 6-Way with OTO

Posting Permissions

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