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

Thread: Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

  1. Back To Top    #1

    ChuckDavis's Avatar
    Join Date
    Aug 2010
    Location
    Durham, NC
    Posts
    73

    Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

    I had my pool nicely balanced, with CYA at 50. I normally keep my FC at 2-3, with Borates. I then did an AA stain treatment, including 3 bottles of Jack's Blue Stuff as sequestrant. The Blue Stuff got up to around 18 ppm.

    A couple of weeks later, when I tested CH, CYA and Borates, my CYA was barely registering on my TF test kit. (Followed by a thankfully minor algae breakout.) Other than a bit of rain and a couple of backwashes, there wasn't any significant dilution of the pool. The pool did turn milky after the AA treatment, which is normal, but filtering and clarifier took care of it.

    The only other unusual factor is that I changed the zeolite in my filter after the AA stain treatment. (It was due to be changed anyway, so I figured I'd be certain to get rid of all the metals that were lifted, sequestered and filtered.)

    I'm bringing the CYA back up, but I'm curious if it was the AA and/or Jack's Blue Stuff that disappeared the CYA and, if so, why. Is there anything else that can eat CYA? Is there any chance the reagent for the CYA test suddenly went bad and the test results are incorrect? (It was fresh this spring.)
    Last edited by ChuckDavis; 05-14-2016 at 01:44 PM. Reason: Turn on e-mail notification
    15,000 gallon IGP, epoxy surface, waterfall, borates (!), not closed in winter
    SuperPump with 2.4 THP EcoTech variable speed motor, Tagelus TA-60 filter with zeolite media, Liquidator, AquaComfort heat pump, Blue-White flowmeter, Smartpool Wall Climber
    TF-100, LaMotte metal sequestrant test kits
    Sundance Capri hot tub

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,585

    Re: Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

    Neither AA nor Jack's Magic Blue Stuff (HEDP sequestrant) will affect CYA. It is also unlikely to be related to a "bad" reagent, the R-0013 almost never goes bad and I have used 2 year old R-0013 before which gave exactly the same results as a fresh bottle.

    The only thing that reduces CYA is water exchange. If you had a water leak, then you can expect your CH, borates and CYA to all decrease in roughly the same proportion. Any water leaks?
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  3. Back To Top    #3

    ChuckDavis's Avatar
    Join Date
    Aug 2010
    Location
    Durham, NC
    Posts
    73

    Re: Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

    No leaks, and CH and Borates held. That's why this is a head-scratcher.
    15,000 gallon IGP, epoxy surface, waterfall, borates (!), not closed in winter
    SuperPump with 2.4 THP EcoTech variable speed motor, Tagelus TA-60 filter with zeolite media, Liquidator, AquaComfort heat pump, Blue-White flowmeter, Smartpool Wall Climber
    TF-100, LaMotte metal sequestrant test kits
    Sundance Capri hot tub

  4. Back To Top    #4
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

    Curious, what your FC and CC readings were during this time? CYA can convert to ammonia, have you been struggling to attain a FC reading during this process?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  5. Back To Top    #5

    ChuckDavis's Avatar
    Join Date
    Aug 2010
    Location
    Durham, NC
    Posts
    73

    Re: Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

    No problem with FC or CC.

    I was still tuning the Liquidator for the season (and after jiggering flow rate with the zeolite change and putting the heater back in-circuit) and FC got a little low which (in conjunction with the low CYA) allowed the algae breakthrough. One jug of chlorine fixed that problem, though.

    This may just end up as another entry in the annals of Weird Pool stuff!
    15,000 gallon IGP, epoxy surface, waterfall, borates (!), not closed in winter
    SuperPump with 2.4 THP EcoTech variable speed motor, Tagelus TA-60 filter with zeolite media, Liquidator, AquaComfort heat pump, Blue-White flowmeter, Smartpool Wall Climber
    TF-100, LaMotte metal sequestrant test kits
    Sundance Capri hot tub

  6. Back To Top    #6
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Can CYA be "disappeared" by AA and/or Jack's Blue Stuff?

    Bacteria consuming the CYA is really the only possibility. And that can only occur with low FC below minimum for your CYA. With CYA of 50 your target FC is 6 and min is 4, so 2-3 is well below min and AA and sequestrant can both consume FC. Chlorine CYA Chart
    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
  •