Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 2 of 2

Thread: FAS DPD test

  1. Back To Top    #1

    Join Date
    Apr 2008

    FAS DPD test

    What does it mean if I get no color change when adding 1 heaping spoon of 870 powder, then two. No change to pink. This has happened only this last test. Previous test 3 days ago showed up fine.

    FC, CC, TC ?
    PH 7.8
    TA 100
    CYA 40
    22K Gal double roman IG, vinyl, 300lb Crystal-Flo sand filter, 1 hp Sta-Rite pump, WF on pool side with 1.5 hp Challenger pump.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: FAS DPD test

    That means that FC is probably zero. To find out CC you need to continue with the test.
    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

Posting Permissions

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