Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Test left out - color changed

  1. Back To Top    #1

    Test left out - color changed

    So I do my routine tests as a part of a SLAM but leave all the chemicals in the vial (lazy...and I was up at an ungodly hour to test). Anyway, overnight test has FC 15 and 0 cc but left it there and this morning (ok, was morning before too - but now everyone else awake) and the chemicals/water in the vial are now purple instead of clear. Explanation anyone? (evap of chlorine?)
    30,000 Gallons, DE filter, IG, Plaster, 2 HP centurion for filter and same for waterfall, 20+ years old, Polaris 360, hot tub attached

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Test left out - color changed

    It's normal for the test to run back pink if you leave it sit for a little while (and I guess purple if you leave it long enough).
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3
    jcowart's Avatar
    Join Date
    Jun 2012
    Labelle, TX

    Re: Test left out - color changed

    That's normal. You can also change the ph test. Don't shake up your sample bottle or blow across your sample. It will give a higher reading. I have seen it go back pink, but never purple.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

  4. Back To Top    #4
    Mod Squad Patrick_B's Avatar
    Join Date
    Jun 2011

    Re: Test left out - color changed

    I's simply a degradation of the reagents and reactions of the test. Nothing to be concerned about except dirty glass ware. Best to rinse right away and be clean for next time and let nothing deposit in your vials.
    TFP Moderator
    Essential Links:
    TF-100 Test Kit, ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Flagstone, 36"SF, Pentair VS Pump, EasyTouch W/Remote, Rheem 400KBTU Htr

Posting Permissions

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