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Thread: Florida Winter Algae?

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    FlyAU98's Avatar
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    Florida Winter Algae?

    My pool has been pretty much algae free since I fired the pool guy and started the TFP method. I probably didn't brush it as often as I should, but it probably got brushed every 1.5 weeks through the summer, and that has continued through the winter.

    The last few weeks I have started having algae (I assume) growing on the walls, worse on the South side than the north (pool is closely aligned with the long way east-west). It brushes away into a light greenish/brown cloud, which then clouds up the pool.

    I'm in South Florida, with solar heat, so the pool stays in the very low 80s during the day, FC level is maintained within the recommended 4-6 with a CYA of 40-50. (That said, it was probably around 3.5 tonight when I added Cl, but tonight was an anomaly)

    Tonight's Cl test (after adding about 18-20oz of 10.5% Cl and discovering it needed to be brushed):
    FC=5
    CC=0.5
    pH= ~7.7

    Last weeks full test (didn't have time for a full run tonight):
    FC=7
    CC=0 (CC has been 0 since 9/28 when it tested at 0.5 and it had been 0 for long before that)
    pH=7.5
    TA=90
    CH=250

    On January 6th, CYA was 40 (after 3 days of tablets while I was away). There has not been anything to raise CYA since January 4th.
    15.5K gal, concrete, 1HP AO Smith pump, Hayward C1200 cartridge filter, Zodiac T5 Duo auto cleaner, 8 panel solar heater controlled by Hayward Aqua Solar GL-235

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    JasonLion's Avatar
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    Re: Florida Winter Algae?

    I'm not sure how it got started, but that sure sounds like mustard algae. Mustard algae grows on the walls and prefers the shaded side of the pool. You should go read the article on fighting mustard algae.
    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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    FlyAU98's Avatar
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    Re: Florida Winter Algae?

    My wife rushed me out the door to dinner while I was prepping to add the chlorine to SLAM... so I just dumped in a 2.5gal jug of Cl instead of measuring out the ~2.1 gal Pool Math called for to get to 20.

    Retested before bed...a few hours after the addition:
    FC=28
    CC=0.5

    It still looks a little cloudy via the pool light, but I rarely run it, so I'm not 100% sure what it would look like if perfect.

    Via a google image search on "mustard algae pool", this is the only image that came up that even resembles what I had, but the sample image algae is MUCH darker and I didn't have any visible on the steps (a path my pool cleaner took through it was clearly visible though):

    Its dark out now and I brushed it before I thought to take a photo, so I don't have a picture of my problem.
    15.5K gal, concrete, 1HP AO Smith pump, Hayward C1200 cartridge filter, Zodiac T5 Duo auto cleaner, 8 panel solar heater controlled by Hayward Aqua Solar GL-235

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    FlyAU98's Avatar
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    Re: Florida Winter Algae?

    I forgot to mention...

    We have a big tree (oak?) in the front yard that has been dropping leaves like mad lately, a fair amount has made it into the pool, requiring daily skimming. This leaf issue has probably been going on about the same amount of time as this potential algae problem.
    15.5K gal, concrete, 1HP AO Smith pump, Hayward C1200 cartridge filter, Zodiac T5 Duo auto cleaner, 8 panel solar heater controlled by Hayward Aqua Solar GL-235

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    FlyAU98's Avatar
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    Re: Florida Winter Algae?

    Morning Cl Test, sample taken 22 min after sunrise, under heavy cloud cover :
    FC=25 (drop of 3ppm)
    CC=0.5 (same)
    15.5K gal, concrete, 1HP AO Smith pump, Hayward C1200 cartridge filter, Zodiac T5 Duo auto cleaner, 8 panel solar heater controlled by Hayward Aqua Solar GL-235

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    JasonLion's Avatar
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    Re: Florida Winter Algae?

    Remember to brush the pool daily while at shock level, you should brush everywhere, but especially on the walls where the algae appeared.
    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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    Join Date
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    Re: Florida Winter Algae?

    This sounds very much like my problem, see http://www.troublefreepool.com/threa...low-Green-Dust. The material is over all of the sides and bottom including the built in steps with no noticeable lighter and heavier areas. I am in central Florida on the Gulf side. I have several large oaks but very few leaves get in the pool since the pool is screened.
    14x28 in-ground plaster, ~ 15000 gal, Hayward C9002 cartridge filter, 1 HP Flotec pump, Heat Siphon heat pump. 12 Mil blue solar cover, liquid chlorine.

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