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Thread: Mustard Algae, Pollen, Dirt???

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    Mustard Algae, Pollen, Dirt???

    I have brown powdery substance that is getting into the indentions on the floor of my pool. This brown stuff is in the areas of the return jets giving me the opinion that this stuff is going thru my system filter and all and being redistributed into my pool. We have had allot of pollen this year, however wouldn't the filter catch this? At lease the backwash water was yellow indicated that pollen was filtered out. I can vacuum this stuff up, backwash the filter, and it re-appears a few days later in the areas where the return jets are aimed. I have been trying to keep my pool at shock level for the last five or six days because of an algae problem but that is a separate topic. Seems like I heard somewhere that Mustard algea was smaller than standard algae and that to truly get it out of your pool you needed to vacuum to waste?

    FC-14 added 364oz. of 6% bleach this morning after test. Should raise FC to 18
    CC-0
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    TA-120 I was trying to hit 100 so I could put borax in but ended up overshooting it.
    35K IG Vinyl 20 x 40 self built pool, Hayward Pro Series High-Rate Sand Filter 31" 98gal/min, Hayward TriStar 1.85hp, Hayward 400btu heater, BBB method w/Hypo, Jazz light w/matching fiber optic rope lighting around coping w/syncronized color wheels. Concrete Paver deck.

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    TravisD's Avatar
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    Re: Mustard Algae, Pollen, Dirt???

    I have the same thing and have asked myself the same questions. I have researched on the site a bit and it seems that everyone deals with this problem. I have come to the conclusion that in my case it is very fine dirt and maybe some pollen but not algae. In my case, however, I do not think it is going through my filter and being reintroduced to the water. A few things you can do to try and determine if it is in fact passing through your filter is use a skimmer sock in front of your return eye. Unscrew it and put a piece of the sock there so it will catch any debris that may be passing through. Also, put a skimmer sock in your skimmer basket. I have done this and it really does cut down on the amount of debris that actually makes it to the filter.
    I think it is just fine particles of dirt and such that get in your water from different sources, like nearby roads, wind, cutting the grass, etc., that settle to the bottom of the pool.
    Unfortunately, it seems to be something that most people with an open air pool have to deal with.
    24' Round AGP | 13,600 Gallons | Waterway Cartridge Filter | Waterway 2 Speed Pump | K-2006 Test Kit
    100% Trouble Free Since The Baqua Conversion

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    Re: Mustard Algae, Pollen, Dirt???

    I have been trying to keep my pool at shock level for the last five or six days because of an algae problem but that is a separate topic.
    My belief is that it is the same problem. I think you are still killing some algae (yes, in that clear pool) and that is the dead algae dropping out and collecting in the low spots of your floor.

    The conclusive way to determine that is an overnight FC loss test. How to perform that test is in Pool School but post back if you have any questions about it.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Mustard Algae, Pollen, Dirt???

    Quote Originally Posted by jasonknox
    I have brown powdery substance that is getting into the indentions on the floor of my pool. This brown stuff is in the areas of the return jets giving me the opinion that this stuff is going thru my system filter and all and being redistributed into my pool. We have had allot of pollen this year, however wouldn't the filter catch this?
    My FC level doesn't drop overnight, my CC is 0.0, and I still have the light powdery stuff (light grey/brown). Like you it settles in the indentations in front of the jets.

    I found that some DE added to my sand filter helped clear it up, but I still have some... That's what the daily brushing and weekly vacuum jobs are for!

    Terry in NC
    Triad Region of NC
    18x37 Vinyl IG (24,000 gal.), BBB & GoldLine AquaLogic PS4 SWG, Hayward 1 HP Superpump / Hayward Sand Filter / Polaris 280 cleaner / 6 deck jets / Sheer Descent Waterfall (in coping) / Brick Red Concrete Coping / Stamped Concrete Deck
    Lots of oak trees, maple trees, *and* leaves!

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