Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: Not sure if I may have a mustard Algae issue or not

  1. Back To Top    #1

    Join Date
    Aug 2015
    Location
    Lowell, MA
    Posts
    60

    Not sure if I may have a mustard Algae issue or not

    I have an inground, indoor gunite therapy pool at my business. (Please disregard my signature at the bottom as that is for my pool at home). Recently, there has been yellowish staining along some of the walls and near the deep end that does not seem to brush off. The indoor pool is approximately 24,000 gallons and is sanitized with bromine tablet with an in-line brominator. The temperature of the water is maintained 92 degrees. The water was just changed out about 3 months ago and the current measurements are as follows:

    FC 2
    PH 7.4
    TA 110
    CH 240
    CYA 0

    It is an indoor public pool, generally we try to keep the FC around 2-3 ppm, but recently I seem to be having difficulty maintaining the levels consistently and seems to be dropping faster than usual. We have an extremely high bather load (150 bathers/week) so I am used to adding bromine tabs and liquid chlorine regularly to keep up, but it seems to be going through more than usual to maintain. It does have a few skylights so I thought that maybe the fact that it seems to be going through sanitizer quickly and the FC/Br levels are not maintaining and the yellowish staining on the walls that maybe I could have a mustard Algae issue??

    I had the pool water (and the fill water) tested today at the pool store for metals and they said there were none. My questions are Do I have a mustard algae issue? If so, should I SLAM for mustard algae and then do an OCLT? What level should I raise the FC to if my CYA is 0? I read 12 for MA but that is with CYA at 20ppm. Or, do you think it isn't a MA issue and could I possibly have something else?

    Thanks in advance,
    Darin
    Last edited by dmccarthy; 10-14-2015 at 09:23 PM. Reason: additional info
    Pool install 6/2015, 27,000 gal in-ground, vinyl, 16 mil clear solar cover
    Hayward Pro Series 300lb high-rate sand filter
    Hayward Tri-Star 2-speed Model# SP3215EE pump
    Hayward Goldline Aqua Plus Salt generator with Hayward T-cell-15 for up to 40,000 gal
    Aquacomfort electric heat pump model# ACT1100

  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
    Posts
    8,497

    Re: Not sure if I may have a mustard Algae issue or not

    You have me confused, are you sanitizing with bromine or chlorine? You talk about both in this thread.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  3. Back To Top    #3

    Join Date
    Aug 2015
    Location
    Lowell, MA
    Posts
    60

    Re: Not sure if I may have a mustard Algae issue or not

    Bromine, but add liquid chlorine when shocking

    - - - Updated - - -

    Sorry, bromine tabs through an in-line brominator to maintain normal FC/Br levels. I add liquid chlorine as needed when levels drop or CC gets above .2ppm. Hope that clears it up.
    Pool install 6/2015, 27,000 gal in-ground, vinyl, 16 mil clear solar cover
    Hayward Pro Series 300lb high-rate sand filter
    Hayward Tri-Star 2-speed Model# SP3215EE pump
    Hayward Goldline Aqua Plus Salt generator with Hayward T-cell-15 for up to 40,000 gal
    Aquacomfort electric heat pump model# ACT1100

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Not sure if I may have a mustard Algae issue or not

    that does not seem to brush off.
    That's not mustard algae.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

    Join Date
    Aug 2015
    Location
    Lowell, MA
    Posts
    60

    Re: Not sure if I may have a mustard Algae issue or not

    any idea what it might be?
    Pool install 6/2015, 27,000 gal in-ground, vinyl, 16 mil clear solar cover
    Hayward Pro Series 300lb high-rate sand filter
    Hayward Tri-Star 2-speed Model# SP3215EE pump
    Hayward Goldline Aqua Plus Salt generator with Hayward T-cell-15 for up to 40,000 gal
    Aquacomfort electric heat pump model# ACT1100

  6. Back To Top    #6

    Join Date
    Aug 2015
    Location
    Lowell, MA
    Posts
    60

    Re: Not sure if I may have a mustard Algae issue or not

    I have never had this yellowing before on the gunite surface, especially after having just changed the water out 3 months ago. It is definately in patches in the deep end and some of the corners and steps. After a year or so and when we finally change the water out we may seem some mild discoloration on the surface, but not like this. Could it be something from the bathers? Otherwise, the water is clear and all the other measures appear to be normal. Other than that it seems to be going through bromine tabs more than usual to keep the bromine residual between 4-6ppm (around 2-3ppm on FC readings). I also seem to be adding liquid chlorine (12.5%) to the pool more than usual (2x/week) anywhere from 1/2 gallon to gallon to help reactive the bromine and keep the levels up between 4-6 and reduce the CC. I am aware that with bromine you can't distinguish between combined bromine and free available bromine and I am only testing the residual with that, however we use the taylor test kits that are recommended on this site for all the free, combined and total chlorine and residual bromine. Could it be a problem with my filter?? We have a 500lb high-rate sand filter that is about 5-6 years old.

    Again, I had both the pool water and the fill water tested yesterday for copper, iron, etc at the pool store and nothing came up. Any suggestions on what you think it might be would be most appreciated.

    Thanks
    Pool install 6/2015, 27,000 gal in-ground, vinyl, 16 mil clear solar cover
    Hayward Pro Series 300lb high-rate sand filter
    Hayward Tri-Star 2-speed Model# SP3215EE pump
    Hayward Goldline Aqua Plus Salt generator with Hayward T-cell-15 for up to 40,000 gal
    Aquacomfort electric heat pump model# ACT1100

  7. Back To Top    #7
    Swampwoman's Avatar
    Join Date
    Apr 2012
    Location
    Grand Rapids, MI
    Posts
    3,537

    Re: Not sure if I may have a mustard Algae issue or not

    Can you post a pic of the stains?

    What is your water source?

    Will a crushed up vitamin c lighten the stain?

    Sometimes metals don't show on tests if the water has been sequestered, the metal has precipitated into a stain, etc. eg. I was once told by a pool store I had no metals...but I had all the signs and a wellwater source. I've since bought my own test and long since confirmed and treated for metals etc. but te point is had I "believed" the pool store I'd still be chasing my tail
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
    If TFP has helped you, please click to SUPPORT TFP!
    Helpful Links:
    GET A TEST KIT Chlorine/CYA Chart How to SLAM About Metals & Stains

  8. Back To Top    #8

    Join Date
    Aug 2015
    Location
    Lowell, MA
    Posts
    60

    Re: Not sure if I may have a mustard Algae issue or not

    I will try and get you a pic later today. The water source is municipal. Do you recommend any test kits that test for metals that I could purchase to test on my own? I have not added any metal free or anything to the water, just some clarifier (usually weekly after shocking) and occasionally a few capfuls of pool perfect.

    Can I do the crushed up Vitamin C underwater? Not sure how to do that. Could I hold a tablet against the pool wall underwater for a few min? Would that work?

    Thanks
    Pool install 6/2015, 27,000 gal in-ground, vinyl, 16 mil clear solar cover
    Hayward Pro Series 300lb high-rate sand filter
    Hayward Tri-Star 2-speed Model# SP3215EE pump
    Hayward Goldline Aqua Plus Salt generator with Hayward T-cell-15 for up to 40,000 gal
    Aquacomfort electric heat pump model# ACT1100

  9. Back To Top    #9

    Join Date
    Jun 2011
    Location
    Long Beach, CA
    Posts
    2,671

    Re: Not sure if I may have a mustard Algae issue or not

    Try brushing the stains with a stainless brush and post the results. Is the plaster pitted or rough in those areas?
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

  10. Back To Top    #10
    Swampwoman's Avatar
    Join Date
    Apr 2012
    Location
    Grand Rapids, MI
    Posts
    3,537

    Re: Not sure if I may have a mustard Algae issue or not

    Can I do the crushed up Vitamin C underwater? Not sure how to do that. Could I hold a tablet against the pool wall underwater for a few min? Would that work?
    That should work...you just want to see f the vit c effects any change, and should see a reaction or lightening in a minute or two if it is a metal stain.
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
    If TFP has helped you, please click to SUPPORT TFP!
    Helpful Links:
    GET A TEST KIT Chlorine/CYA Chart How to SLAM About Metals & Stains

Posting Permissions

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