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

Thread: CYA has dropped off the scale

  1. Back To Top    #1

    Join Date
    Feb 2014
    Location
    Dallas, TX
    Posts
    77

    CYA has dropped off the scale

    The last time I checked my CYA levels was in March/April and it was at 50 and had been steady for the prior couple months. I checked it today and I can still barley see the dot with the cylinder completely full. I did 3 tests to be sure. I have only added a couple inches of water(plus rain) since the last test. I'm not sure where it went. I did do an AA treatment in May. I saw a thread saying that may lower CYA but it wasn't very conclusive. Could it be bad test chemicals? My CYA chemical is about 5 months old and has been stored indoors.

    Temp 84
    FC 5
    CC 0
    pH 7.6
    TA 90
    CH 310
    CYA <30

    Pool is using about 110 oz of 8.25 bleach a day to hold around 5-6 FC. We have a lot of trees so the pool does not get a lot of direct sun. Should this low CYA be a concern? If the test chemicals are bad I don't want screw up and put too much CYA in because I know how big a pain it is to get out. I had to do a 60% water change when we bought the house due to high CYA.

    I have a bunch of pucks from the previous owner. I was thinking of throwing one of those in to see if I can get it back up on the scale at least. Thoughts?
    Tom,
    22k IG plaster pool, Haywood DE6020 Pro Grid DE filer
    Century Centurion 2 HP single speed with Challenger Pentair front housing replacement. Polaris 280 and Polaris PB4-60 pump. Stenner Injection
    Pool is probably 1980-1990 vintage. Concrete deck

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    8,997

    Re: CYA has dropped off the scale

    Someone else will chime in concerning your AA treatment, but it is not the age of your test chemicals or the way they were stored for sure.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  3. Back To Top    #3
    ship of fools's Avatar
    Join Date
    Nov 2011
    Location
    Albany, NY
    Posts
    495

    Re: CYA has dropped off the scale

    Seems like a bit too much bleach but i cant see your pool size on my phone. I use about half that each day with a 21k gallon pool and cya of 40.


    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

  4. Back To Top    #4
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,199

    Re: CYA has dropped off the scale

    Do you have an auto-filler on your pool?
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  5. Back To Top    #5

    Join Date
    Feb 2014
    Location
    Dallas, TX
    Posts
    77

    Re: CYA has dropped off the scale

    Test kit stored in the house
    Pool is 22000 gallons
    No auto filler
    Tom,
    22k IG plaster pool, Haywood DE6020 Pro Grid DE filer
    Century Centurion 2 HP single speed with Challenger Pentair front housing replacement. Polaris 280 and Polaris PB4-60 pump. Stenner Injection
    Pool is probably 1980-1990 vintage. Concrete deck

  6. Back To Top    #6

    Re: CYA has dropped off the scale

    Being in TX. I bet the pool is 80 degrees or above right?
    I bet that is the reason for the loss, which is only about 3 PPM per day.
    Do a test overnight for chlorine loss just to make sure.
    I use a gallon of 12.5% every other day.
    That works out to 2.5-3 ppm loss per day for my pool.
    I did an overnight test with minimal loss of chlorine so nothing growing I don’t want.

    I keep the CYA about 60-70 range and it seems to help with the loss.
    Last year when I first moved into the house the CYA was above 100.
    I was using a 121 Oz of 8.25% everyday when the pool was over 80 degrees.

Posting Permissions

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