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Thread: Green dust on bottom of pool

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    Green dust on bottom of pool

    I have a problem with my pool. All of my chemicals are pretty good but when you brush the bottom it is a big cloud of green.
    My FC =9.5
    CC= <.5
    TC=10
    PH=7.6
    TA=90
    CH=160
    CYA=85
    I am using the TF100 test kit and the BBB method for the last 4 weeks.
    I am now shocking the p[ool. I just don't get how yesterday and this morning I have 0 CC but somehow today I developed green all over the bottom of the pool. I have raised my FC to 21. It is tuff to get much higher but I 'm working on it. Any thoughts and help with this problem would be greatly appreciated. I am very diligent in checking the water balance every morning and adding whatever I need to add. I just thought that as long as the #'s were right this wouldn't happen.
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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    Optica's Avatar
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    Re: Green dust on bottom of pool

    How sure are you about the CYA level. It's pretty high if this is not a salt pool. If you were off on the CYA by 10 or 20..easy to do, you may have dropped below the minimum available FC chlorine level to maintain sanitation and prevent algae from growing.

    If you are sure of your CYA level, you might consider draining some water to lower it. For very sunny non SWG pools, its typically around 40-50 as the recommended level. Lower if you do not get that much sun. this will lower the required FC levels to maintain and for shocking. See the pool calculator for what you need to hold and shock at.

    What are you using as your chlorine source? liquid or tablets or powder?
    ___________________________________________________
    12,000 Gal IGP, Gunite/Plaster, Pentair DE & Pump, Heliocol Solar, K-2006, BBB'd & Borated.

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    Re: Green dust on bottom of pool

    Thanks Optica, I am using bottled bleach, 6%. I do know my CYA is high and I am trying to replace some of the water. However I have 270000 gallons and the pool calculator says I need to replace half of it. I just can't afford to do that at this time so I have been keeping my FC at 9.5. I do not have an SWG pool. It is in full sun almost all day. I am going to Wally World in the early morn to buy more bleach. It is just very frustrating when I keep it all so nice and then all of the sudden I have this issue...again, and again, and again!! Thanks for the support , Maybe next year after I do drain half of the water it will be a little bit easier.....
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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    frogabog's Avatar
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    Re: Green dust on bottom of pool

    Have you ever fallen below 7ppm?

    It really only takes once.

    Could you drain 25% this year?
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    Re: Green dust on bottom of pool

    Quote Originally Posted by CindyG1
    Thanks Optica, I am using bottled bleach, 6%. I do know my CYA is high and I am trying to replace some of the water. However I have 270000 gallons and the pool calculator says I need to replace half of it. I just can't afford to do that at this time so I have been keeping my FC at 9.5. I do not have an SWG pool. It is in full sun almost all day. I am going to Wally World in the early morn to buy more bleach. It is just very frustrating when I keep it all so nice and then all of the sudden I have this issue...again, and again, and again!! Thanks for the support , Maybe next year after I do drain half of the water it will be a little bit easier.....
    Cindy, would it be safe to assume there is one too many zeros in the 270,000 gal of water?
    If not I don't know how you afford the bleach either. One thing I would do, after you finish shocking is start adjusting my FC in the evening. I like to do that because if more chlorine burns off than you expect from the sun it's only low a few hours and not for 12-16 hours it will be if you do it in the mornings.
    10,800 gallons Gunite/Plaster
    Hayward 244t 24" Sand Filter with Zeo
    1 1/2 HP Challenger
    Digital Pool Pilot DIG-220 SC-48
    Located in NOLA

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    Optica's Avatar
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    Re: Green dust on bottom of pool

    CindyG1,

    Do you get the green stuff on the walls too or only on the floor? Algae would tend to grow on walls too unless the walls get very little sunlight. I am kinda wondering if this is not algae but some type of pollen dust or something else since you haven't been seeing any significant combined chlorine levels. Are you passing the OCLT?.


    Anybody else seen anything green like this that wasn't algae? Most pollen posts i've seen have it yellow/brown colored. Where are you located? Maybe someone in the same general area can speak up about known things (types of pollen) in your area

    If it is algae, we will be with you to give encouraging words and assistance where we can during the shock process. Good luck!.
    ___________________________________________________
    12,000 Gal IGP, Gunite/Plaster, Pentair DE & Pump, Heliocol Solar, K-2006, BBB'd & Borated.

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    Re: Green dust on bottom of pool

    Quote Originally Posted by Optica
    Anybody else seen anything green like this that wasn't algae? Most pollen posts i've seen have it yellow/brown colored. Where are you located? Maybe someone in the same general area can speak up about known things (types of pollen) in your area

    Yep. I fought it as if it were algae for 2 weeks and was about ready to throw in the towel. Then I read that some people who thought they had algae really had pollen. I started by trying a skimmer sock. My pool had been downright murky for a week or more with very little visibility. It took 2 days to notice a difference with the sock, but it did show improvement. Then I decided to try some DE. I added DE per the pool school instructions and brushed the entire pool to stir everything up real good, and 24 hours later I saw a HUGE improvement. We were almost back to sparkling, but then we got a big rain storm 2 nights ago and it got dirty again. I can tell that this will be an ongoing battle, but at least I won't need to keep buying bleach by the truckload anymore.
    Doughboy 18x38 AGP buried 2' deep. 18,400 gal. Hayward Power Flo Matrix. Hayward Pro Series High Rate Sand Filter. TF-100 test kit.

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    Re: Green dust on bottom of pool

    I live in Ga mountain area. I am surrounded by trees. I never thought of pollen but maybe your right. My cc's still aren't even at 1 , they are staying less than point 5. Oh, and yes ...I did have one too many zero's...my bad. I am passing the OCLT and there is nothing on the walls of the pool. The green dust does make the water cloudy when I brush but by morning the pool is sparkling clean. (until I brush again)...
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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    Re: Green dust on bottom of pool

    Oh ...one more thing...I have drained 25% and it didn't do it...It did get me below 100 though. Also...I am using DE in my sand filter...My water looks pretty...just not the bottom.
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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    Re: Green dust on bottom of pool

    I am going to attach a pic to show the trees. We also just built a deck but I vacuumed diligently to keep the dust out...[attachment=0:1csnazur]P1010023 - Copy.JPG[/attachment:1csnazur]
    Attached Images Attached Images
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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    Re: Green dust on bottom of pool

    Hi, Cindy,

    You have not shocked the pool. You need to get the FC up around 30ppm and hold it up there until your pool is crystal clear. That'll take a HUGE amount of bleach compared to what you have been using but there is no way I can think of around it.

    How long each day do you run the pump? It should be running 24/7 until you can clear up that cloudiness. What type of filter do you have? Has it been cleaned/backwashed?

    Go into Pool School and Read How to Shock Your Pool. If you follow those instructions precisely, your water will be crystal clear but it will never get that way if you continue using inadequate chlorine levels. Sorry to be blunt and bring bad news but you may as well decide to clean it up now or get ready to put it away for the fall.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Green dust on bottom of pool

    Hello and good morning Duraleigh, I have not been posting my numbers on shocking the pool. I have not been at 30 , however, for the last 4 days I have been at 26.5 and the lowest it has gotten when I add more bleach is 21.5. I am writing it all down in a book each day so my numbers are accurate. I have passed the OCLT the last 3 mornings. I do still have a greenish cloud when I sweep. I am trying to get to 30 but now am wondering if it is even algae I am dealing with. The water is sparkling clear. I have read Pool School, numerous times and it does say that you can shock at lower levels...it just might take a little longer. Thing is...I pass all the tests. But...I still get a cloud when I sweep.
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

  13. Back To Top    #13

    Re: Green dust on bottom of pool

    Can you post a new picture? It does not look sparkling clear in the photo above. Having passed the OCLT is certainly a good sign, but, at least in that picture, the water looks dull and thick. Could just be the angle or lighting?
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

  14. Back To Top    #14

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    Re: Green dust on bottom of pool

    You are right, crek31. In that pic it wasn't sparkling. I used that one to show the trees and it is an older pic. Her is one I just went outside and took. It is not sunny outside yet as it is only 7:30 AM here. But you can see the bottom of the pool and the ladder quite well.[attachment=1:1cb7qxf2]P1010088.JPG[/attachment:1cb7qxf2][attachment=0:1cb7qxf2]P1010089.JPG[/attachment:1cb7qxf2]
    Attached Images Attached Images
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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    Re: Green dust on bottom of pool

    Here is a pic of what it looked like after the storm...it is what I think created this issue. I cleaned it immediately the next morning . The storm was at night...but, I think all of the debris is what made such a mess. I did sweep and vacuum it the very next morning following the storm.[attachment=1:1uzkl6hq]P1010082.JPG[/attachment:1uzkl6hq][attachment=0:1uzkl6hq]P1010086.JPG[/attachment:1uzkl6hq]
    Attached Images Attached Images
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

  16. Back To Top    #16

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    Re: Green dust on bottom of pool

    So my question is...if it is pollen do I just vacuum a lot? Or do I keep shocking the pool? It doesn't seem like it can get any clearer, I just get a green cloud when I sweep. I dropped the net into the pool so you could see how clear the water is and am attaching the pic. Also some more pics of all the trees around my pool.[attachment=2:1b7f34k2]P1010096.JPG[/attachment:1b7f34k2][attachment=1:1b7f34k2]P1010102 - Copy.JPG[/attachment:1b7f34k2][attachment=0:1b7f34k2]P1010103.JPG[/attachment:1b7f34k2]
    Attached Images Attached Images
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

  17. Back To Top    #17

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    Re: Green dust on bottom of pool

    Shocking doesn't help against pollen. A skimmer sock may. Running the pump longer and adding DE to the sand might be worth considering, also.
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

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    Re: Green dust on bottom of pool

    Quote Originally Posted by Beamup
    Shocking doesn't help against pollen. A skimmer sock may. Running the pump longer and adding DE to the sand might be worth considering, also.
    I'm with on all three. I'm hoping the DE helps and I might try some clarifier as well. The stuff might be going through the sand filter.
    How long do you run your filter now?

    Am I the only one wondering if that filter kinda small as well?

    I have a larger filter than that and my pool is half the size. I would have gone up to the 27" if it wasn't for the fact I would have had to pay freight instead of free shipping. Coming from a DE filter I was worried about clarity so I went with the ZeoSand or ZeoBright whatever they call it now.
    10,800 gallons Gunite/Plaster
    Hayward 244t 24" Sand Filter with Zeo
    1 1/2 HP Challenger
    Digital Pool Pilot DIG-220 SC-48
    Located in NOLA

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    Re: Green dust on bottom of pool

    I bought this from a family member in need of money for only $500.00. It is the filter that came with it. So next season should I look into a larger filter? And the pump? I have added DE and I will try the skimmer sock. Does everyone agree that it is not algae then and I should stop shocking? I need some guidance here...
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

  20. Back To Top    #20

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    Re: Green dust on bottom of pool

    oh...I am running the filter for 12 hours a day...8 AM to 8PM
    33 ft round x 52", vinyl
    Hayward 1.5 hp pump
    sta-rite 2.18ft ,200 lb sand filter
    24500 gal.
    Hayward Salt & Swim3

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