Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: CYA drop

  1. Back To Top    #1

    Join Date
    Mar 2016
    Location
    Phoenix, AZ
    Posts
    41

    CYA drop

    I test my CYA around twice a month. On 7/7 and 8/6 my CYA was at 60. I tested it today and it was at 40.

    When I test my CYA I look at the cylinder, in sunlight at waist level and I have my wife do the same. This gives the test a little more validity in my opinion.

    I live in Phoenix and we have not had that much rain recently. What would explain the drop of 20 points in just over two weeks?

    I decided to throw a few chlorine tabs in my floater as well to elevate my CYA back to ~60.
    10,000 gallon, inground, pebblesheen, sand filter, TF-100 testing kit, Pentair Rebel

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: CYA drop

    There are a few things that can/will reduce cya.

    You normally lose 2-3 ppm per month, up to 5 ppm in 90+ water
    High fc, such as SLAMing can lower CYA a bit faster
    Rain overflow
    Splash out
    Draining and refilling
    FC dropping below minimum can allow bacteria to grow and consume it and convert it to ammonia or nitrates
    The test is typically +/-10 ppm
    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

  3. Back To Top    #3

    Join Date
    Mar 2016
    Location
    Phoenix, AZ
    Posts
    41

    Re: CYA drop

    That's exactly what I thought pooldv. Our FC never dropped below 6.0. We did splash a bit of water out to lower our TA. And with a margin of error of +/-10 I suppose we are still in range
    10,000 gallon, inground, pebblesheen, sand filter, TF-100 testing kit, Pentair Rebel

Posting Permissions

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