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Thread: Black Algae for MONTHS!

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    Join Date
    Sep 2015
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    Magnolia, TX
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    Unhappy Black Algae for MONTHS!

    Help me....LOL. I am a frequent flyer at Leslies Pool to buy Algae cleaner. I have had this infestation of black algae since May. A combination of problems got us there, our salt cell died and it took the builder 3 weeks to get the problem fixed, it was so hot this summer and the pool is in direct sunlight, we had A LOT of rain for our area, and Leslies was out of salt for weeks at the beginning of the summer. All of that said though....I have been trying to get rid of it this entire time and I cannot get it gone. I have cleaned the filters twice since May, they weren't even that dirty last time. My PH is 7.6-7.8, my CYA level is 80, my salt level and chlorine level are normal(I can't remember the exact numbers). Everyone is stumped. I have used black algae cleaner, and copper algecide multiple times. I shock, wait 6 hours, then put in the algecide, and repeat the process the next day. While most of the spots fade, they don't go away and they just come right back.

    I have a 36,000 gal Pebbletec pool.

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    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    Re: Black Algae for MONTHS!

    Hello and welcome to TFP! I can't say I'm surprised everyone is stumped. That happens a lot at the pool store. First priority MUST be to order your own proper test kit. See the TF-100 link below in my sig and order either the TF-100 or Taylor K-2006. I have the TF-100 and it's a great value. Your pool has algae simply because it does not have the proper sanitation level of FC in relation to CYA. I would suggest you do the following:
    1 - Order the proper test kit as noted above ASAP
    2 - Do not add anything else to your water other than one gallon of regular liquid bleach. HEB or Wal-Mart generic is fine @ 2.98 per gallon.
    3 - Start reading the SLAM link below in my sig. You will need to perform a "SLAM" once your test kit arrives.
    It's as simple as that. Honestly, the pool store has done that to many of us, and now it's time for you to take charge of your pool. We'll help you. Once you get your kit, please post for us: FC, CC, CYA, pH, TA, and CH. Have a great evening.

    - - - Updated - - -

    I can't emphasize enough to NOT put any more algaecide products in the water. Many of them contain copper which is a metal that can stain your pool and/or change hair to green if the chemical levels allow it to do so. Also, please add your pool info to your signature by going to the top of the TFP web page (just under the Pool School button) and select "SETTINGS". On the next page look to the left for a menu bar that says, “MY SETTINGS” and go to "EDIT SIGNATURE" to enter your pool and equipment info there. It will help us later.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  3. Back To Top    #3

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    PAGirl's Avatar
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    Jun 2012
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    Re: Black Algae for MONTHS!

    How many times, if you can remember, did you use the copper algacide?
    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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    In the Industry

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    Re: Black Algae for MONTHS!

    You will only kill the black algae by getting the head off each black algae spot, then treat.

  5. Back To Top    #5

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    Re: Black Algae for MONTHS!

    If you can scrape some up, then smear it on a piece of paper, you might find it is actually green algae. That happens quite often. In any case, a full SLAM would be in order.
    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!

  6. Back To Top    #6

    Join Date
    Jan 2010
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    Spring Texas
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    Re: Black Algae for MONTHS!

    I have the same problem. But I was too lazy to haul bleach and brush. I did the Leslie's algae killer @49.99 and it did a half assed job for two weeks. Then the black was back and doubled in size. I shocked with my last years shock and another $49.99 slate killer. Got less of a result the second time. Went back to Leslie's the clerk said "oh your chlorine level is too high for the algae killer to work". That's about the stupidest thing I have ever heard. I went straight to HEB bought 10 -1.5 gallons of bleach and started slamming. It's been 10 days the black is 90% and i have brushed 4 times.

    I am sticking to the TFP people's wisdom not some kid that just got out of high school.
    20000 gal in ground Pentair Screenlogic 2 ez-touch 4
    Teledyne heater Compupool 40k Salt generator
    Pentair VS pump Hayward 4025 Cartridge Filter
    12 person Spa The Pool Cleaner robot
    lot of bushes and trees close to the pool

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    justinfrancisjudd's Avatar
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    Dec 2014
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    Temecula, Ca
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    135

    Re: Black Algae for MONTHS!

    Quote Originally Posted by rdeputy View Post
    I have the same problem. But I was too lazy to haul bleach and brush. I did the Leslie's algae killer @49.99 and it did a half assed job for two weeks. Then the black was back and doubled in size. I shocked with my last years shock and another $49.99 slate killer. Got less of a result the second time. Went back to Leslie's the clerk said "oh your chlorine level is too high for the algae killer to work". That's about the stupidest thing I have ever heard. I went straight to HEB bought 10 -1.5 gallons of bleach and started slamming. It's been 10 days the black is 90% and i have brushed 4 times.

    I am sticking to the TFP people's wisdom not some kid that just got out of high school.
    Words of a very wise man! Even with good monitoring algae can still form, but if your monitoring it can be killed before its an issue fast
    2015 Build, Stonescapes Mini Pebble-Blue Sea, 46.5'x23', 9' deep, Paramount IFCS on steps and shelfs, 8' spa with spillover, Quartzite Flagstone Coping and Patio, 3" Suctions and Returns, 1 skimmer, 6 Jandy LED Watercolor lights, Baja Shelf w/ diving rock, 2x 2HP Jandy VS E-Pump, Jandy LXI 400K BTU Heater Cupro/Nickel exchanger, Cartridge Filter, Grotto/Waterfall/ Slide, Jandy SWG, I-aqualink 2.0

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