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Thread: Possible Mustard Algae

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    Possible Mustard Algae

    A little history first - I made a huge mistake when I opened this season. I vacuumed and backwashed many times over the first couple days instead of just vacumming to waste. I have absolutely no idea what I was thinking. Stupid.

    For the last couple weeks I've been having what looks like very fine dirt collect all over the bottom of the pool. This is accompanied by a yellowish green haze around it, and sometimes streaks if I let it go a couple days. If I run my hand over it, it disappears. I havent picked it up to feel it, but I'm pretty convinced it's not sand. I dont think it's pollen since there's not that many trees around.

    I have an above ground salt water pool. My FC levels were consistently at 6 with a CYA at 70. Over the last week or 2, I've vacuumed to waste every couple days and then topped off the pool to bring the water back to the proper level. It comes back and after 3 days, it's a pretty good amount in the pool. It collects around the edges as well as in the middle, and really fills in the lower spots and wrinkles in the liner.

    Here's my current levels from an hour ago:

    FC 2
    CC 0
    PH 7.8
    TA 100
    CH 90
    CYA Less than 30


    My plan of attack is to start SLAM today, which I dont think will be a problem to pass tonight since the water is crystal clear and there are no other signs of algae, and then up to mustard shock level. Is this the right action or should I just go right to mustard algae level?
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    Perform all the steps of the SLAM first. Then go to MA shock level for 24 hours.
    42' natural free-form pool, vinyl lined, 6' deep end, 21,400 gallons
    2 HP Hayward Superpump, Hayward Aquarite SWG, AquaComfort 125k btu heat pump, 350lb Hayward Pro Series sand filter
    2 skimmers, 2 floor drains, 10 returns (6 in the pool, 2 in the steps, 2 in the swim-out)
    TF-100 Test Kit

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    Re: Possible Mustard Algae

    Please keep us updated with your progress and results, I'm having the identical situation with my pool as you are with the very fine debris on the bottom every day or two after vacuuming or brushing that won't filter out, even when vacuuming to waste. I am planning to SLAM to Mustard Algae level this weekend when I will be able to monitor FC level. I'm curious to find out what happens with yours to better prepare me for my experience. I'm really hoping this solves my problem, I've been struggling with this problem since last year and have tried pretty much everything else to get rid of it, with nothing working. Good Luck and keep us updated with your progress and results.

    Thanks,
    cruiser310

    25,000 gallon, 33'x54" Round AG Sharkline Matrix, 26" sand filter, 2 speed, 1 hp Pentair optiflo pump

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    Re: Possible Mustard Algae

    To clarify, you don't 'SLAM to Mustard Algae level'. You shock to the appropriate level of FC relative to your CYA level and hold it there (Shock level and Maintain) unitl you pass a OCLT, then you push it up to Mustard Algae level only after you completed a proper SLAM.

    http://www.troublefreepool.com/conte...tain-shockingl
    http://www.troublefreepool.com/threa...rine-CYA-Chart
    http://www.troublefreepool.com/conte...-mustard-algae

    Then, if you're me, you sorta pray it doesn't come back.
    42' natural free-form pool, vinyl lined, 6' deep end, 21,400 gallons
    2 HP Hayward Superpump, Hayward Aquarite SWG, AquaComfort 125k btu heat pump, 350lb Hayward Pro Series sand filter
    2 skimmers, 2 floor drains, 10 returns (6 in the pool, 2 in the steps, 2 in the swim-out)
    TF-100 Test Kit

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    Re: Possible Mustard Algae

    Quote Originally Posted by cruiser310 View Post
    Please keep us updated with your progress and results, I'm having the identical situation with my pool as you are with the very fine debris on the bottom every day or two after vacuuming or brushing that won't filter out, even when vacuuming to waste. I am planning to SLAM to Mustard Algae level this weekend when I will be able to monitor FC level. I'm curious to find out what happens with yours to better prepare me for my experience. I'm really hoping this solves my problem, I've been struggling with this problem since last year and have tried pretty much everything else to get rid of it, with nothing working. Good Luck and keep us updated with your progress and results.

    Thanks,
    cruiser310
    No problem. Adding 3-5 cups of bleach every couple hours. FC drops to 9 and I have to keep pushing it back over 10.
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    Sorry I havent updated, but I had to work yesterday and I had my daughters do the testing and adding. Here's a rundown of the last 36 hours or so. My CC was always 0 so I'm not listing that each time.

    Thursday night:

    Had to brush the pool twice today. Had some pockets of algae on the bottom.

    4:30 pm - FC 12
    6:00 pm - FC 10. Added 5 cups bleach
    8:45 pm - FC 6.5 Added 12 cups bleach (Daughter did this one. I think it's off, but added 12 cups bleach)
    10:00 pm - FC 18

    Friday:

    One very small patch on the bottom today. Brushed twice anyway.

    1:00 am - FC 14
    6:00 am - FC 13
    10:00 am - FC 10 - added 4 cups bleach
    1:30 pm - FC 13
    8:30 pm - FC 10 - added 4 cups bleach
    10:00 pm - FC 11 - added 2 cups bleach
    11:15 pm - FC 13

    Saturday:

    6:00 am - FC 11 - added 4 cups bleach

    It's going to be 98 degrees and humid today. Pool is full sun and my CYA is under 30. I have to go out and wont be home between noon and six. My SWG has been turned off since Thursday. Should I add bleach and bump the FC to compensate or should I turn the SWG on super chlorinate for that time?
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    Don't use the SWG to SLAM. Use chlorine only. What does your water look like? I think you can cut back to testing and adding 3 times daily but tell me qabout your water first.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Possible Mustard Algae

    The water is pretty clear. There are 2 very small patches on the bottom. Just swept it again. I can attach some pics if it helps.
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    pics always help
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Possible Mustard Algae

    Here's a couple. The small algae spots at in the shadow of the railing.
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    It would be helpful if you put something on the floor of the pool so we had a frame of reference w/ regards to the clarity.
    42' natural free-form pool, vinyl lined, 6' deep end, 21,400 gallons
    2 HP Hayward Superpump, Hayward Aquarite SWG, AquaComfort 125k btu heat pump, 350lb Hayward Pro Series sand filter
    2 skimmers, 2 floor drains, 10 returns (6 in the pool, 2 in the steps, 2 in the swim-out)
    TF-100 Test Kit

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    Re: Possible Mustard Algae

    You will pass the SLAM quickly......your water is very nice.

    Why is your CYA below 30? I would add enough to bring it to 30 and then SLAM. I see no indication of mustard alge, either. I would do a normal SLAM but make sure you pass the OCLT and then go swimming.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  13. Back To Top    #13

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    Possible Mustard Algae

    CYA is below 30 because I vacuumed to waste what I thought was dirt and dust that the filter wasn't catching. 4 times. Stuff came back with a vengeance and had to vacuums every 2 days. Had to refill after each time. It would disappear if I disturbed it. It was a yellowish brown/green color.

    Some of it came back and settled in the depressions again this afternoon. FC dropped to 6 because I had to go somewhere today. Bumped it back up and brushed again. It all poofed away as it always did.
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    Passed the OCLT. FC was 15 at 9:30 last night. 14.5 at 6:30 this morning.


    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    So have you then met the other two criteria which signifies the end of your SLAM?

    I think so but I want to get everyone in the habit of meeting all three.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Possible Mustard Algae

    CC is still 0 and the water is clear. I do still have very small patches of the yellowish brown fine substance on the bottom. No where near what it used to be.
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    That typically means you are still killing algae. Why don't you vacuum them up and see if more fall tomorrow. If it does, you have not really finished the SLAM.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Possible Mustard Algae

    Lost 3 FC overnight this time. Not sure if rain has anything to do with that, but we had a pretty severe thunderstorm dump a good amount of rain about an hour before testing.
    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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    Re: Possible Mustard Algae

    Here's a couple pics from this morning. All the things in the pool have been in there for 24 hours. A couple very small patches. The biggest one didn't just poof away. It smeared.

    21' Round Ovation Impact, 54" wall. Hayward AquaTrol SWCG, Hayward 1.5 HP pump, Hayward S180T sand filter, Aqualuminator with fountain attachment, Taylor K2006C test kit

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