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Thread: What Is This in The Bottom Of My Pool

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    Join Date
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    What Is This in The Bottom Of My Pool

    I fight this stuff every year and don't know what it is! If I vacuum it is gone and then I backwash the pump and 30 minutes later it returns! It like a fine dust. Dead algae maybe???? I have always attributed it to being just dust that has settled or residue from baking soda or borax that has settled. Then last year i decided it could be mustard algae? But I have kept the pool at shock level for 3 days. Yesterday was the first day we were able to use the pool. The pool was crystal clear and NOTHING on the bottom and then the kids stayed in for 4 hours and I forgot to backwash after they got out. a couple of hours later I went out to clean up around the pool and this stuff was all over the bottom. Any ideas??? I want it out! My Chlorine was still at shock level after they got out so I just don't have a clue.
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    30' Round Vinyl AG, 21,200 K GAL. with Main drain, Hayward 1.5 HP Pump, Sand filter, BBB Method & TF~100 Test Kit

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    Re: What Is This in The Bottom Of My Pool

    Looks like wisps of dust and/or dirt to me.

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    Re: What Is This in The Bottom Of My Pool

    We put the Wedding Cake steps in at the start of the day but I scrubbed them down with bleach inside and out first to make sure I didn't get anything in the pool. Could my boys be that dirty??? LOL! This stuff is all over the bottom of the whole 30'! I guess I will be vcuuming again today!
    30' Round Vinyl AG, 21,200 K GAL. with Main drain, Hayward 1.5 HP Pump, Sand filter, BBB Method & TF~100 Test Kit

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    Mod Squad Bama Rambler's Avatar
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    Re: What Is This in The Bottom Of My Pool

    We have a lot of dirt settle in our pool. Regular vacuuming is the only way keep it down. As long as people are swimming it gets stirred up and yu don't see it but as soon as they get out and the water settles a little it settles right back on the bottom.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: What Is This in The Bottom Of My Pool

    So do I need to vacuum every day???I used to have the kreepy auto vac...Hated it so I am back to manual vacuuming with a pole.
    30' Round Vinyl AG, 21,200 K GAL. with Main drain, Hayward 1.5 HP Pump, Sand filter, BBB Method & TF~100 Test Kit

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    JasonLion's Avatar
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    May 2007
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    Re: What Is This in The Bottom Of My Pool

    Your FC level might be just slightly too low, or the debris might have been blown in by high winds. If your FC level is just a little too low, stuff like that will appear every day. It will often also appear for two or three days after any significant storm.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: What Is This in The Bottom Of My Pool

    Thanks Jason....I upped the FC a little while ago guessing according to these cheapo test strips from Walmart! But I ordered the TF~100 and it will be delivered today so will finally get some accurate test results later! We did have a storm come up last evening so that could be part of it! I have pine trees and every time the wind blows I am dipping pine needles out of the pool. I would love to cut them down...they cause my pool all kinds of problems.
    30' Round Vinyl AG, 21,200 K GAL. with Main drain, Hayward 1.5 HP Pump, Sand filter, BBB Method & TF~100 Test Kit

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    Re: What Is This in The Bottom Of My Pool

    I have the same problem. I think these particles are to small for a sand filter to filter out. I have in the past vacuumed to waste so that these particles do not get introduced back into the pool. This will not cure the problem 100% but is does help.
    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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    Re: What Is This in The Bottom Of My Pool

    I think you are right Jason. It seems like when I get close to it with the vacuum head it just poofs back up into the water instead of being sucked up. And then what is sucked up doesn't get filtered by the sand. I guess I'm going to vacuum again. LOL!
    30' Round Vinyl AG, 21,200 K GAL. with Main drain, Hayward 1.5 HP Pump, Sand filter, BBB Method & TF~100 Test Kit

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    Mod Squad woodyp's Avatar
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    Re: What Is This in The Bottom Of My Pool

    My pool rover jr. sure picks up some awfully fine stuff. Doesn't go thru the filter either.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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