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Thread: Algea? Or what?

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    Algea? Or what?

    Trying not to "close" pool this year. Been using solar cover and leaf net, monitoring numbers at least every other day, adding bleach as needed. Running pump everyday on low 8 hrs. Sometimes split between hi and low. Most recent numbers

    FC - 7
    CC - 0.
    pH - 7.3
    TA - 50
    CYA - 40
    water temp 66

    Vacuuming when necessary, but finding stuff on bottom that looks streaky and is tougher to remove. Other day also brushed after vacuuming ran pump on high and today, streaky stuff back, kind of yellowish color. Regular dirt (or dead algea as usual) What's with this? HELP>
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Re: Algea? Or what?

    Got a pic? Unless you have some sort of source for yellow dirt that's getting in your pool, then it's likely algae.

    What do you mean, "tougher to remove?"
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Algea? Or what?

    It almost looks like runny bird poop and some of it needs a brush to completely remove from surface
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Re: Algea? Or what?

    Have pic on phone but don't know how to get it here
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Mod Squad pooldv's Avatar
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    Re: Algea? Or what?

    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Algea? Or what?

    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Mod Squad pooldv's Avatar
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    Re: Algea? Or what?

    Im on my phone right now so I cant see the pic that well. But it looks like it could be black algae. More here, Pool School - Black Algae
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Algea? Or what?

    It certainly looks like algae but I suspect it is dead algae on the bottom of your vinyl pool.

    The next step is to SLAM the pool correctly.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Algea? Or what?

    Started SLAM last nite after vacuuming and brushing. The brushing threw up clouds of stuff giving water slight cloudiness. Ran pump all night. This AM clearer but spots where algea hard to scrub up were back again in same trail spots20161017_093326_resized.jpg a yellowish color. Will continue SLAM. Will try to scrub harder.
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Mod Squad pooldv's Avatar
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    Re: Algea? Or what?

    The elevated FC level should help lift the stains. Don't scrub too hard.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Algea? Or what?

    I am curious though. Been a TFP'r since last year and had no trouble all season. Have kept all chemicals up to correct numbers and don't understand why now dealing with stuff. Is it because of solar cover with leaf net? Water temps have been dropping (slowly - we keep having temp spikes - 80's this week (pool only 65 so no swimming) Have been running pump every day. Any thoughts?
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Mod Squad pooldv's Avatar
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    Re: Algea? Or what?

    There are a few possibilities.

    Areas with low circulation and not enough chlorine
    Less brushing and less feet on the bottom
    FC snuck down a little too much toward min for your CYA, FC/CYA Chart
    More organic matter in the pool using up FC

    Keep FC a few ppm above target for your CYA, FC/CYA Chart, as extra insurance
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Algea? Or what?

    Thanks for suggestions.
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 3 yr old Hayward Vari-Flo sand filter, pool 10(?) yrs old, well water, testing with Taylor K2006

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    Re: Algea? Or what?

    What about the use of the solar blanket? Can it have an effect on the algae problem? I never had any algae til I put the blanket on this fall. All chem. levels were the same as in the summer and the water was crystal clear.
    New June 2016, Radiant Metric oval above ground (mostly in ground) 18'x32'x52" vinyl, 13000 gal. Hayward Dream Line high-rate sand filter, 1.5 hp PowerFlo LX Pump, Aqua Trol RJ SWG, Hayward SharkVac, 16ml. Solar Blanket

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