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Thread: Where did all my chemicals go?

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    Where did all my chemicals go?

    End of last summer I had:

    TA 120
    CH 240
    CYA 70
    Borates 50

    This week I had:

    TA 80
    CH 70
    CYA 0 (less than 20 anyway)
    Borates 10

    The Pool Calculator tells me I would have had to drain 70-80% to drop the levels like that. Could I really have lost that much or do I probably have a leak? I use a autofill system.

    25,000 gal IG colored plaster pool, 6 years old w/ cartridge filter
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    Melt In The Sun's Avatar
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    Re: Where did all my chemicals go?

    If you're worried about a leak, shut off your autofiller and do a bucket test!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: Where did all my chemicals go?

    I'd suggest turning off the autofill and check for a leak. If it was only CYA, I'd say "That can happen, although it doesn't always", but since TA and CH dropped, I'd be searching for a leak.
    32x16 ft Grecian rectangular vinyl pool 8ft on deep end - 19000 gal. 18" Hayward S-240 sand filter. 250K BTU Pentair MasterTemp heater. Hayward 3/4 HP Super Pump.

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    svenpup's Avatar
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    Re: Where did all my chemicals go?

    CYA can be converted to ammonia over the winter, and TA could drop on it's own, but CH wouldn't just disappear.

    It is probably worthwhile to check for a leak..
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: Where did all my chemicals go?

    Thanks everyone and svenpup thanks for the link.

    I checked for air in the pump basket - none and no bubbles in the pool. I checked around the equip pad for wet spots. Nothing.

    Next should I just shut off the autofill and wait? I won't worry about evaporation with the cover closed. Should I have the pump turned off for this test?

    25,000 gal IG colored plaster pool, 6 years old w/ cartridge filter
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    Re: Where did all my chemicals go?

    I'd turn off the autofill and leave everything else "as-is". If your level drops less than an inch, you may want to put a bucket next to it to check for evaporation all the same (don't know if your cover is mesh, or how that impacts evaporation.)

    Just getting the autofill turned off should let you see what's going on with the level. Just watch your water level so it doesn't get too low.
    32x16 ft Grecian rectangular vinyl pool 8ft on deep end - 19000 gal. 18" Hayward S-240 sand filter. 250K BTU Pentair MasterTemp heater. Hayward 3/4 HP Super Pump.

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    Melt In The Sun's Avatar
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    Re: Where did all my chemicals go?

    Since nobody asked, how are you testing? If those are pool store or strip tests, one or both could be bogus.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: Where did all my chemicals go?

    I use the TF100 kit.

    I'll mark my water level as soon as the kids are out of the pool, then see how much it drops in 24 hours. Will you guys be around tomorrow? LOL! Just kidding I know someone is always here when I need help! You guys are awesome!

    Jill
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    sonflower's Avatar
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    Re: Where did all my chemicals go?

    I agree. The people here at this forum totally ROCK!
    Pool: (2003) IG Plaster 14,209 gallon (Water Surface 421 sq. ft.) ~ Spa: 18" raised kidney
    Triple spillway (Waterfall) ~ With 6' slide ~ Hayward's Goldline Controls Aqua Rite Digital Electronic Chlorine Generator (Salt System) ~ 40K Salt Cell ~
    ~ AquaLink RS -4 ~ Purex Whisper Flow 2 HP~ Aquatech 60 sq. ft. DE Filter Normal Pressure 22 # ~ MiniMax NT (Propane) Heater 400,000 BTU ~ Jandy Valve Actuator ~Letro Legend Cleaner ~ K-2006 & K-1766 Test Kits

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    JasonLion's Avatar
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    Re: Where did all my chemicals go?

    Water replacement seems like the leading theory, but there is another way this could have happened, though it seems much less likely. TA and CH both go down when there is calcium scaling. CYA can vanish over the winter. And the borate test is difficult to read with any precision, so the change in borates might not be real, or might be smaller than indicated. That requires three separate things to have happened, while water replacement only requires a leak and an autofill, but it isn't impossible.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  11. Back To Top    #11

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    Re: Where did all my chemicals go?

    So I thought my test was foiled by the unexpected rain we got today. But despite the rain I lost 3/8 inch in 24 hours.

    Now to find whether a leak is in the pool or the plumbing, what do you suggest I do? The instructions on leak detection say to plug the skimmers and drains but I can't think of any way to do that. Has anyone done this before?

    Jill
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    frustratedpoolmom's Avatar
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    Re: Where did all my chemicals go?

    The pool stores sell plugs, etc, for winterization. If your local dealer doesn't carry them, you could order from the internet.
    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

  13. Back To Top    #13

    Re: Where did all my chemicals go?

    How many inches of rain do you get in the winter? does that get into the pool (cover solid or mesh?)
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  14. Back To Top    #14

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    Re: Where did all my chemicals go?

    After doing a search I found a test I could perform:

    cya-dropped-from-50-to-20-t23869.html?hilit=pool leak

    My result was 1/2 inch loss with pump off vs. 3/4 inch loss with pump on. This would indicate a leak on the suction side of the plumbing. Of course I could have more than 1 leak.

    At this point is there a way to find the leak myself or is it time to call in the pool service? If I could find the leak I would probably have to have an expert fix it, but my local plumber would surely charge me less than the out-of-town pool service would. Any ideas?
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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