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Thread: Dirt Stains?

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    rickster's Avatar
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    Dirt Stains?

    I've had this pool for 6 years, and this is the first time this has come up. I vacuum my pool and check the chemistry every week.

    For the past two months there's been this dirt looking stain in my pool. Which has actually caused me to vacuum it twice a week since it looks really bad. I tried googling around to see if I could see what this could be. I don't think it's pollen, because pollen floats? So I'm guessing it's dirt?

    I brush the pool before I vacuum, and i'm able to get all of the dirt when i'm done cleaning. But it keeps coming back every 3-5 days. Is there any way to prevent this? I don't have a time lapse camera to record whats going on. Maybe a squirrell is digging up the dirt in my planters? This is the first time this has happens in my 6 years of owning this pool, so I don't know what's causing this.

    Here are some pics (those darker spots are leaves)









    1) 40k gallons
    2) DE filter
    3) in ground
    4) plaster w/ quartz crystals
    5) 115 GPM

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    Re: Dirt Stains?

    Looks like algae but I'll defer to the experts.
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
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    Polaris 380 cleaner and booster pump

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    reebok's Avatar
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    Re: Dirt Stains?

    that looks like algae to me too...
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    rickster's Avatar
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    Re: Dirt Stains?

    Well my PH and Chlorine levels are fine. And i've shocked the pool twice in the last month. So you really think it's algae? I guess i should keep shocking it till it goes away?
    1) 40k gallons
    2) DE filter
    3) in ground
    4) plaster w/ quartz crystals
    5) 115 GPM

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    reebok's Avatar
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    Re: Dirt Stains?

    looks like some algae I've had before, and I've had all kinds, heh. but you're really lacking in some needed info that can be found in the "read this before you post" article.
    pool-school/read_before_you_post
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Mod Squad JohnT's Avatar
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    Re: Dirt Stains?

    Looks like algae to me too. If your CYA level is high, you need much more chlorine than conventional wisdom dictates.
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    20K Gallon 20X36 Vinyl Inground
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    frustratedpoolmom's Avatar
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    Re: Dirt Stains?

    I'll chime in too....kinda looks alot like mustard algae

    Test results please!

    I suggest you do an overnight FC test. If your FC holds- it isn't algae.
    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
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    Re: Dirt Stains?

    Looks like the same mustard algae I fought all last season.
    20K IG Fiberglass, 3/4 hp Sand, Hayward ColorLogic

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    Re: Dirt Stains?

    Quote Originally Posted by rickster
    Well my PH and Chlorine levels are fine. And i've shocked the pool twice in the last month. So you really think it's algae? I guess i should keep shocking it till it goes away?
    What are you your water measurements (FC, CC, PH, TA, CYA, CH)?
    What does "PH and chlorine are fine." mean?
    What is your chlorinating method?


    Please understand that we help out by using the actual water measurements. Otherwise we are would be just guessing while looking at a picture of a pool of water and "stuff".
    Measurements may be important for us to help, but are necessary for you to help yourself! 8)
    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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    rickster's Avatar
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    Re: Dirt Stains?

    With some shocking and scrubbing I managed to make the algae go away.

    I think my problem is chlorine, i've been having to add some to the pool each week. So at the end of the week the chlorine level is really low. I have a aqua rite chlorine generator, is there anyway to test that it's working? I have it working at the highest setting it will go. Anyway I can replace a part of it instead of buying a whole new one for $300?
    1) 40k gallons
    2) DE filter
    3) in ground
    4) plaster w/ quartz crystals
    5) 115 GPM

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    frustratedpoolmom's Avatar
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    Re: Dirt Stains?

    Once Algae gets hold, the SWG can't keep up. Shocking is what usually fixes the problem. Once you control it, the SWG should be okay, if not, have it checked out.

    Keep shocking with liquid chlorine and do the overnight FC test (follow the instructions in Pool School), and you can stop shocking when the FC holds overnight.

    When you are done shocking, I'd advise you to run with a higher than normal level of FC to keep the algae away, as mustard algae - if that was it - can be resistant to chlorine. Keep your FC at about 2ppm more than you normally would.
    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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    JasonLion's Avatar
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    Re: Dirt Stains?

    There is nothing wrong with your SWG. You have algae. The algae is consuming the chlorine faster than the SWG can produce it. The algae hasn't completely taken over because of the SWG, which is just barely able to hold it in check. Simply adding some chlorine and vacuuming up the dead algae you can see doesn't kill it all. You need to shock the pool, which means maintaining a high FC level for some time. See the directions on how to shock at Pool School.
    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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    Ohm_Boy's Avatar
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    Re: Dirt Stains?

    Your generator may not be at fault. What you need most right now is a full set of test numbers.
    Anything you do without knowing your water's chemistry is just guesswork, and may even make things worse. If you don't have a test kit capable of at least free and combined or total chlorine, ph, ta, and cya tests, then take a sample to a pool store to at least get a ballpark idea. Post your numbers here.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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    Butterfly's Avatar
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    Re: Dirt Stains?

    It is a good idea to add your SWG to your profile.


    Welcome
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    rickster's Avatar
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    Re: Dirt Stains?

    Quote Originally Posted by JasonLion
    There is nothing wrong with your SWG. You have algae. The algae is consuming the chlorine faster than the SWG can produce it. The algae hasn't completely taken over because of the SWG, which is just barely able to hold it in check. Simply adding some chlorine and vacuuming up the dead algae you can see doesn't kill it all. You need to shock the pool, which means maintaining a high FC level for some time. See the directions on how to shock at Pool School.
    I see thanks for that. I'm actually running low on my test kit supplies. What/where would you recommend I purchase new kits?
    1) 40k gallons
    2) DE filter
    3) in ground
    4) plaster w/ quartz crystals
    5) 115 GPM

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    Butterfly's Avatar
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    Re: Dirt Stains?

    We have an article on test kit comparisons in Pool School.

    The most popular and biggest bang for the buck is the TF100 sold by duraleigh at http://www.TFTestKits.net.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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