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Thread: Dead Algae Always There

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    Join Date
    Jul 2016
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    Maynard, MA
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    Dead Algae Always There

    My pool AG 27 ft with sand filter is sparkling clear. But after running filter dead algae remain on bottom in clumps. I have tried vacuuming and vacuuming to waste but that does not solve problem. I changed sand, even changed to fine Zeosand but no dice. The algae seem to puff into smoke when I vacuum, and if you step on the algae it disappears. I tried experiment by vacuum to waste, getting pool to look clear, then ran a pump in pool circulating water but bypassing filter completely by keeping it shut off. After 30 minutes I shut off pump and again all the dead algae appeared on bottom. I also tried flocculent and skimmer socks ; nothing works. I have had this problem for seven years now and am about to give up and deal with it, but any suggestions?

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    Piolin's Avatar
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    Sep 2010
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    Miami, FL
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    Re: Dead Algae Always There

    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

  3. Back To Top    #3

    Join Date
    Jul 2008
    Location
    Seacoast, NH
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    248

    Re: Dead Algae Always There

    You have living algae.

    Think of it this way: The only way to get more dead algae after you removed it by vacuuming is for living algae to die.

    How are you chlorinating?

    I suggest Pool School (link above) and, assuming your CYA level is in acceptable range, then SLAMming (instructions in Pool School.)
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

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    Join Date
    Oct 2014
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    Beaumont, CA
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    47

    Re: Dead Algae Always There

    If youve tried vacuuming to waste and algae is still there, then either you have live algae or it never got sucked in by your vacuum. You say it puffs into a cloud of smoke, check the suction of your vacuum.
    16x48 Summer Escapes Pro-Series Above Ground frame pool, 5000 gal, Intex sand filter - Looking for heating solutions for AGPs

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    Join Date
    Jul 2016
    Location
    Saint Joseph, MO
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    45

    Re: Dead Algae Always There

    Is it for sure algae? Couldn't it be pollen or other debris?

    Also, don't forget to rinse after backwashing, before switching to filter.

    CHAD
    24' Above Ground 46.5" deep, 13,147 gal
    Hayward E-Series 25GPM/m2
    Sand 200 lbs
    Hayward Power-Flo LX 1.5hp
    Taylor K2006

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    PAGirl's Avatar
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    Jun 2012
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    Central PA
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    Re: Dead Algae Always There

    I w I uld recommend bumping up FC and doing an overnight chlorine loss test, provided you have a quality test kit.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

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    Aug 2015
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    Cincinnati Ohio
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    Re: Dead Algae Always There

    I'm having the same issue. Just realized 2 minutes ago, my ladder has holes drilled in it so the water will keep in weighted.... check anything and everything that is in your pool... lights ladders inside, outside and underneath. It is dead algae just gotta find where it's coming from.

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    Jul 2016
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    Maynard, MA
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    Re: Dead Algae Always There

    Not sure if it is dead algae or other fine debris. I captured some of the fine stuff in a skimmer sock and it is brownish green. I read somewhere on this site that dead algae is milky white/gray?

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    PAGirl's Avatar
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    Re: Dead Algae Always There

    It can be either. SLAM levels usually turn it white after a few days if there is a lot of it.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

  10. Back To Top    #10

    Join Date
    Jul 2016
    Location
    Saint Joseph, MO
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    45

    Re: Dead Algae Always There

    I have dime sized pockets of dark brown/green here and there in the mornings after everything settles. My pool also sits 20% shaded under giant pecan trees (and squirrels). I've always assumed it was pollen or other tree-related matter, but would like to know for sure.

    CHAD
    24' Above Ground 46.5" deep, 13,147 gal
    Hayward E-Series 25GPM/m2
    Sand 200 lbs
    Hayward Power-Flo LX 1.5hp
    Taylor K2006

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