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

Thread: Going to SLAM next week....a couple questions

  1. Back To Top    #1

    Join Date
    Jan 2014
    The Woodlands, TX

    Going to SLAM next week....a couple questions

    Convinced I've got mustard algae that shows on walls of pool after a day or two of not brushing. Although, when I've done the overnight chlorine loss test, I was consistently under a 1.0 loss. Water is clear.....just a pain getting the yellow off the walls.

    My CYA is 55, which will put my mustard shock level at 22.

    1. Is there any issues with swimming in pool while at 22? I need to get in there to really get a good brushing on my 9' deep end, as well as removing lights and brushing around casings.

    2. The inside of my skimmers are brown with residue. Does come off, but very hard to get a good brushing in there. Good chance this is algae? Any recommendations on scrubbing them real good other than elbow grease?

    3. Is there a way to use my TFT kit to test the chlorine without using so much chemicals? Use 5ml instead of 10 or something? Dilute it?


    15,000 gallon IG plaster with attached spa. Full Pentair EasyTouch system. IC40 SWG. TFT-100

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

    Re: Going to SLAM next week....a couple questions

    1) Yes, and no. We don't recommend swimming at regular shock level or above. However, the actual effects are fairly minor and might not bother you. Worst case, hair and swim suits can be damaged (slowly) by very high FC levels. In practice, you probably won't notice it unless you spend a great deal of time in the water.

    2) Yeah, elbow grease.

    3) A 5 ml sample with the FAS-DPD test does give 1.0 ppm for each drop. The precision goes down when you do this, but it is good enough for measuring mustard algae shock level.
    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