Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: mustard algae?

  1. Back To Top    #1
    Organizer's Avatar
    Join Date
    Aug 2014
    Location
    Jacksonville, FL
    Posts
    10

    mustard algae?

    I've been devouring the info on this site and using BBB for about a year. The site is great - thanks to everyone who makes it so. This is my 1st post.
    Yesterday I discovered my Kreepy Krauly bag had turned green. I soaked it in 40% CL for 3 hours and reinstalled. I then inspected the pool and found several areas of what I believe to be mustard algae on the shaded wall of the pool.



    I cleaned as best I could and raised FC to 10. I did OCLT last night and FC dropped from 8.5 to 8 overnite, 9PM to 6AM.

    So: 1. does this look like mustard algae?
    2. should I SLAM even though I passed OCLT?
    3. if I SLAM, how long would you recommend I keep SLAMming, given that I already pass OCLT?

    I have a new Stenner which I'm getting dialed in and my FC had dropped to 2 yesterday morning. I've been trying to maintain FC of 4-6

    Numbers this morning:
    FC 8
    CC 0.5. (First time I've ever seen anything except 0)
    PH 7.6
    CYA 50
    TA 65
    CH 325

    My fill source is a well with high iron.

    What do you think, folks?
    35,000 Gallon IG Pebbletec pool, Pentair DE Filter, Pentair 1 1/2 HP 2 speed pump, Doheny Discovery cleaner, Stenner for CL automation

  2. Back To Top    #2

    In the Industry

    Donldson's Avatar
    Join Date
    Jun 2009
    Location
    NW Ohio
    Posts
    2,637

    Re: mustard algae?

    Since this is your first post: A belated welcome to TFP!

    Well your description does sound a bit like mustard algae, though if your FC did drop below the minimum it does leave a little doubt. Being in shaded areas is a big red flag though.

    I would bring things up to SLAM level for at least a day, brush the whole pool making especially sure to brush off any visible algae. When you pass the OCLT again then follow the Mustard Algae procedures to the letter. After that be careful not to let your FC drop below the minimum again and hopefully that will be the end of it. If you notice any problems then you will probably need to maintain a bit higher FC than you currently are, but that is a bridge that can be crossed when/if it happens.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: mustard algae?

    Welcome to TFP!

    See the Pool School article on Mustard Algae. You would start off with a regular SLAM to 20 ppm FC (for your 50 ppm CYA) and then increase the SLAM level higher to 30 ppm. You'd need to get behind lights, under removable ladders, etc. to completely eradicate the algae if it is indeed yellow/mustard. Does the algae puff up like dust when you move it? Being yellow/mustard in color and growing mostly on the shady side of the pool does sound more like yellow/mustard algae but it would be dust-like and not clumps that are a little stickier to pool surfaces.

    The OCLT will only pick up larger consumption of chlorine so drops more when you have an algae bloom but doesn't drop very much if you only have limited amounts of algae. That's why the SLAM criteria also includes no longer seeing visible algae to know when you are done.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  4. Back To Top    #4
    Organizer's Avatar
    Join Date
    Aug 2014
    Location
    Jacksonville, FL
    Posts
    10

    Re: mustard algae?

    Thanks for the quick replies. Chemgeek, when I brush, it creates a yellow dust cloud so I think I will proceed on the assumption that it's mustard. I'll have to go in the pool to remove and brush the lights - my hair is grey and I!ll wear an old bathing suit.
    I lowered the ph to 7.2 and CL is now 22. Assuming I pass OCLT tonight, I'll go to 30 ppm tomorrow for 24 hrs.

    I will post progress. Thanks.
    35,000 Gallon IG Pebbletec pool, Pentair DE Filter, Pentair 1 1/2 HP 2 speed pump, Doheny Discovery cleaner, Stenner for CL automation

  5. Back To Top    #5
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,979

    Re: mustard algae?

    Our hair is not grey. It's simply bleached from the sun and being in the pool so much.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  6. Back To Top    #6
    Organizer's Avatar
    Join Date
    Aug 2014
    Location
    Jacksonville, FL
    Posts
    10

    Re: mustard algae?

    Quote Originally Posted by Texas Splash View Post
    Our hair is not grey. It's simply bleached from the sun and being in the pool so much.
    Well said Mr. Splash. I forgot, but that's another thread.
    35,000 Gallon IG Pebbletec pool, Pentair DE Filter, Pentair 1 1/2 HP 2 speed pump, Doheny Discovery cleaner, Stenner for CL automation

  7. Back To Top    #7
    Organizer's Avatar
    Join Date
    Aug 2014
    Location
    Jacksonville, FL
    Posts
    10

    Re: mustard algae?

    It's 7am and I passed OCLT - 21 to 20.5 overnight. CC is less than 0.5. As so as the sun comes up, I will remove the lights, brush everything and raise the CL to 30ppm.

    Somewhere on the forum I read that one could leave the lights on the deck. Seems to me I should leave them "dangling" in the pool during the 24 hrs I'm at 30 ppm CL.
    35,000 Gallon IG Pebbletec pool, Pentair DE Filter, Pentair 1 1/2 HP 2 speed pump, Doheny Discovery cleaner, Stenner for CL automation

  8. Back To Top    #8
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,979

    Re: mustard algae?

    Bumping-up FC for 24hr MA treatment - check. As for the lights, normally we recommend removing and cleaning anything that "can" be removed. But if those light cannot be cleaned out of the pool, you may not have an alternative. Problem is however you don't want anything that may have algae spores on/in it to get added to what you've already accomplished by completing the SLAM. You may have to use your best judgment on that one.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  9. Back To Top    #9
    Organizer's Avatar
    Join Date
    Aug 2014
    Location
    Jacksonville, FL
    Posts
    10

    Re: mustard algae?

    It's been a busy day...I spent 4 hrs this morning removing the lights (no visible algae there) and brushing everything including the lights. I did find some more spots of algae on the shaded wall. I then threw all of the pool tools and toys in the pool. FC is at 30ppm this evening and tomorrow we'll start letting it drift back down and retrieve all the tools and toys.

    I then checked my automated CL system and now know how my FC got so low 2 days ago when I discovered the algae. I found a tiny air leak in the suction line to my Stenner and it was delivering very little CL. Fixed that. I had checked the FC two days before and it was OK, so the algae didn't have too much time to get a foothold. (do algae have feet?)

    When I retired 14 yrs ago, I thought I could relax...now I can't figure out how I had time to go to work.
    35,000 Gallon IG Pebbletec pool, Pentair DE Filter, Pentair 1 1/2 HP 2 speed pump, Doheny Discovery cleaner, Stenner for CL automation

  10. Back To Top    #10
    Organizer's Avatar
    Join Date
    Aug 2014
    Location
    Jacksonville, FL
    Posts
    10

    Re: mustard algae?

    Slam successfully completed. The pool looks great and no sign of algae.
    FC 7.5
    CC. 0
    PH 7.4
    CYA 50
    TA. 65
    CH. 325

    I followed the instructions to the letter and it seems to have solved my MA problem. I really appreciate all the help from TFP.
    35,000 Gallon IG Pebbletec pool, Pentair DE Filter, Pentair 1 1/2 HP 2 speed pump, Doheny Discovery cleaner, Stenner for CL automation

  11. Back To Top    #11
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,979

    Re: mustard algae?

    Very happy to hear that! Always good to know a member made it through everything with "crystal clear" results. Enjoy!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

Posting Permissions

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