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

Thread: cya and bio-active

  1. Back To Top    #1
    Shady Woods's Avatar
    Join Date
    Jul 2015
    Location
    Rio Linda, Ca.
    Posts
    2

    cya and bio-active

    I recently used the Bio-Active product in my pool to lower the cya, no change. Customer service sent me a free bag with specific instructions, no change. I have to wait on a drain and fill. I recently fired my pool company and started doing it myself. tell me what you think of these levels.

    fc = 4
    ph = 7.8
    ta= 80
    ch= 350
    cya = 100

    Water looks great, have never had an algae problem. Am I worrying too much about specific #s?
    28,000 gal in ground plaster pool. 1 hp sta-right system 3 cartridge filter ( 300 sq. ft. ) Polaris 360 cleaner.

  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
    Posts
    8,495

    Re: cya and bio-active

    Welcome to TFP!

    I see a couple of issues..

    100 is the limit of the CYA test, so unless you have verified it with an extended test it may be well above 100.

    Secondly, if it is 100 your chlorine should never be below 7 and you should really target 12 so it never goes below 7.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: cya and bio-active

    Welcome!

    You can maintain a pool with triple-digit CYA. I've done it. I started with 220-240 CYA and water restrictions and Bio-active didn't even exist to try. I don't recommend it because
    1) You have to use the FAS-DPD test every single time because no other test kit can measure the levels of FC you need to maintain
    2) The pH test results will always be suspect, as the reagent reacts above 10 FC. Photographic proof
    3) If you do develop algae, you'll be buying bleach this way:


    I used pool water on my lawn and put what I would have used to irrigate into the pool. It's a long, slow process, but it's the surest way to reduce CYA without incurring the wrath of the water company or have the neighbors come after you with torches and pitchforks.
    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!

  4. Back To Top    #4
    Shady Woods's Avatar
    Join Date
    Jul 2015
    Location
    Rio Linda, Ca.
    Posts
    2

    Re: cya and bio-active

    Richard you confused me when you said " I don't recommend it " are you talking about the high fc levels or the Bio-active? Also if you have fc at 7-12 is there a way to test the ph and ta reliably by diluting the water or something? I check levels daily and even when the weather is hot 95-105* my fc will drop from 4 to 2.5 in the 24 hr period.
    28,000 gal in ground plaster pool. 1 hp sta-right system 3 cartridge filter ( 300 sq. ft. ) Polaris 360 cleaner.

  5. Back To Top    #5
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: cya and bio-active

    Quote Originally Posted by Shady Woods View Post
    Richard you confused me when you said " I don't recommend it " are you talking about the high fc levels or the Bio-active? Also if you have fc at 7-12 is there a way to test the ph and ta reliably by diluting the water or something? I check levels daily and even when the weather is hot 95-105* my fc will drop from 4 to 2.5 in the 24 hr period.
    I don't recommend trying to maintain a pool with CYA above 100. I enumerated my reasons above.
    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!

  6. Back To Top    #6

    Join Date
    May 2015
    Location
    Moorpark, CA
    Posts
    171

    Re: cya and bio-active

    I second what Richard said, based on personal experience. My CYA was 160, and it was a crapshoot for me to keep the water right for sanitation and algae. My CYA is now at 70. Much better. The other bit of good news is I also used some of the pool water for my yard. I flooded a mole with hundreds of gallons of water, and haven't seen a sign of him since. The pool water worked where nothing else would. Also the rose bushes have never looked better.
    Michael

    20,000 gallon in-ground gunite/plaster pool (1992), attached spa with spillway, Pentair Superflo 1.5 HP pump, Smith booster pump for pool sweep, Pentair 2000 DE filter, Sta Rite Max-E-Therm 400 heater, Silencer Blower 2 HP for spa, Polaris 280 pool sweep.

Posting Permissions

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