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Thread: yellow stains keep coming back

  1. Back To Top    #1

    Join Date
    Apr 2015
    Naples, FL

    Question yellow stains keep coming back

    A couple of months ago I was careless and let the chlorine get to 0. The floor and walls turned yellow. So I brushed the stains off and brought the chlorine back to normal. But the stains keep slowly coming back, though the numbers look good. Is a shock necessary once the stains appear? Is that why it keeps coming back? What ppm will be sufficient? Also, will a shock get rid of the stains that are there now on its own or will I still need to brush it off?
    In-ground 12'x26' oblong, ~8,000 gallons, material is something like a concrete with pebble surface
    Pentair system: 1 HP pump, CC150 cartridge filter, UltraTemp 110 heat pump
    Spa with spillover

  2. Back To Top    #2
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Tallahassee, FL

    Re: yellow stains keep coming back

    You need to do a SLAM. It should be a fast one at this time of year with the lower temps. Here is a link. Please note this is a process instead of a one time shock and done. The most important part of the SLAM is the M=maintain. Maintain the FC level at the SLAM level until the SLAM is done.

    Pool School - SLAM - Shock Level And Maintain

    Make sure to keep brushing to get the algae out and into the bleach.

    Let us know how it is going!

    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

  3. Back To Top    #3
    Casey's Avatar
    Join Date
    Apr 2007
    SW PA

    Re: yellow stains keep coming back

    I'd suggest not only SLAMing, but understanding why you're slamming the pool and how you got to where you are by reading the ABC's of Pool Water Chemistry which you can find in my signature.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  4. Back To Top    #4
    Piper Mike's Avatar
    Join Date
    Jan 2014
    Bartlesville, OK

    Re: yellow stains keep coming back

    Yes, I'd SLAM too. The ABC's was very helpful for me. I've gone back and read it a few times now.
    Intex ultra frame 26'x52" above ground pool
    Intex ultra 18'x46" above ground pool retired

  5. Back To Top    #5
    borjis's Avatar
    Join Date
    Aug 2014
    Pacific NW

    Re: yellow stains keep coming back

    Sounds like you have Mustard Algae.

    The SLAM will take care of it. (did one myself with mustard last june)

    Its a good idea to do the overnight chlorine loss tests a few times/days to be sure
    when you get to that point.

    Don't forget to brush daily...twice if you can.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  6. Back To Top    #6

    Join Date
    Aug 2014
    Northern IL

    Re: yellow stains keep coming back

    How is it going?

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