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Thread: Do you think I have Mustard Algae

  1. Back To Top    #1

    Join Date
    Jul 2008
    Location
    Seacoast, NH
    Posts
    248

    Do you think I have Mustard Algae

    Pool was opened a week ago. Was a blue cloudy mess and I have been slamming since then. Now the water looks perfect, but I've been brushing several times a day and I'm still getting those algae puffs, dead algae along the seams, and even an occasional spot where I can see it.

    What is making me wonder about mustard algae is that I read in a different post that it doesn't always cause CC. There's clearly some algae, but why so little CC?

    These are my numbers.

    FC 17
    CC 0.5
    pH (before Slamming started) 7.6
    TA 70
    CH 260
    CYA 40 (based on addition of 6 lbs over last week. Tested when open and it was definitely < 20. Assumed it was zero as I've lost all my CYA every winter prior.)
    Salt 1800, but SWG is off.

    Another question: According to pool calculator, the 6 lbs of stabilizer would reduce by pH by 0.7. I obviously can't test it right now with the FC so high, but that would mean it would be around 6.9 right now. Should I add any Soda Ash or deal with that when i'm done slamming?

    Thanks.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Do you think I have Mustard Algae

    Once most of the algae is dead there is very little CC. Even with a lot of algae, CC sometimes doesn't climb above 1.0. Keep at the SLAM and brushing. Have you performed and OCLT yet? Need patience at this point to see it through and get all the algae filtered out.

    You should have lowered the pH to 7.2 before starting the SLAM as it says in the instructions. At this point, you cannot adjust the pH so wait until the SLAM is complete. You can't assume the pH is at 6.9 and adjust now. Just wait til you're done and worry about the pH then.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3

    Join Date
    Jul 2008
    Location
    Seacoast, NH
    Posts
    248

    Re: Do you think I have Mustard Algae

    ok. Thanks. Yeah, I admit, I didn't refresh my memory on SLAMming before I started.

    I have not done a OCLT test yet as I know the algae isn't all dead yet.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

  4. Back To Top    #4
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: Do you think I have Mustard Algae

    What you are describing does not sound like mustard algae at all.

    Hang in there
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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