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Thread: Algae starting?

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    Join Date
    Apr 2015
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    Algae starting?

    Since draining and refilling (April) to remove my very high CYA levels, I switched from tabs to liquid pool chlorine for the pool. At times I see green (yikes) inside the umbrella receivers that are under water. The pool also uses a lot of muriatic acid and I struggle to get the pH anywhere near 7.8. The pool is tended to on a daily basis and I test every other day.
    I sense the pool is right on the edge of an algae bloom but I hope not.
    What can or should I do differently?

    I just performed Ihe comprehensive T100 tests with the following results:

    pH 8.2
    Cl 5
    FC 3.5
    CC 0
    CH 500
    CYA 30
    TA 88

    Thanks in advance.

    Sylvester
    In ground, Pebbletec, free form pool with attached infinity spa. Total gallons, 11000 built approximately 2002-2003.
    Using Hayward XL pool sweep filtered through a Pentair CCP520, 4 cartridge filter, 3 inch return lines circulated by a 2HP Whisper pump.
    1.5 HP spa blower, Pentair Mini-Max Plus heater for spa and/or pool.

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    Richard320's Avatar
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    San Dimas, CA (LA County)
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    Re: Algae starting?

    SLAM it. Maybe it'll only take one day to pass the three tests, but at least you'll know. Pool School - SLAM - Shock Level And Maintain

    I'd get a turkey baster or some other kind of squeeze bottle and fill it with bleach. Swim down to those umbrella sleeves with a bottle brush or something to clean 'em out, then take that bleach down and squirt it inside. The bleach will settle in those low spots and kill whatever is in there.

    Knock the pH down to 7.2 and then raise the FC to 12 and keep it up there until you pass the three tests. Run everything with the water at shock level, to clear out anything lurking in the lines. And plant the umbrellas a while, too, so any algae spores on them will be killed.

    When you pass the three tests, raise your CYA to at least 50. Your minimum FC level will be higher, but your actual daily losses will be less under the Arizona sun which should help you maintain enough FC to keep the algae from ever starting again.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Algae starting?

    Thank you for that.
    I'll begin by adjusting the pH.
    In ground, Pebbletec, free form pool with attached infinity spa. Total gallons, 11000 built approximately 2002-2003.
    Using Hayward XL pool sweep filtered through a Pentair CCP520, 4 cartridge filter, 3 inch return lines circulated by a 2HP Whisper pump.
    1.5 HP spa blower, Pentair Mini-Max Plus heater for spa and/or pool.

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    Re: Algae starting?

    One more question...can I raise the CYA with a floater and tabs? I'm hesitant to do that as it got me in trouble in the first place. If I do that, how long before retesting the CYA?

    Thanks
    In ground, Pebbletec, free form pool with attached infinity spa. Total gallons, 11000 built approximately 2002-2003.
    Using Hayward XL pool sweep filtered through a Pentair CCP520, 4 cartridge filter, 3 inch return lines circulated by a 2HP Whisper pump.
    1.5 HP spa blower, Pentair Mini-Max Plus heater for spa and/or pool.

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    Richard320's Avatar
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    Re: Algae starting?

    Quote Originally Posted by sylvester View Post
    One more question...can I raise the CYA with a floater and tabs? I'm hesitant to do that as it got me in trouble in the first place. If I do that, how long before retesting the CYA?

    Thanks
    Yes, you can. But wait until AFTER the SLAM, otherwise your shock level will increase.

    Take a gander at Effects Of Adding Chemicals down near the bottom of poolmath. If you have your volume entered up top, down there it will tell you the amount of CYA added by each ounce of trichlor. Just figure out how many ounces you can use safely to raise the CYA to your target and use no more than that. When the least of 'em has dissolved, recheck your CYA.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Algae starting?

    Quote Originally Posted by Richard320 View Post
    Yes, you can. But wait until AFTER the SLAM, otherwise your shock level will increase.

    Take a gander at Effects Of Adding Chemicals down near the bottom of poolmath. If you have your volume entered up top, down there it will tell you the amount of CYA added by each ounce of trichlor. Just figure out how many ounces you can use safely to raise the CYA to your target and use no more than that. When the least of 'em has dissolved, recheck your CYA.
    Will do.
    By the way, after raising the FC per slamming instructions, I rechecked 8 hours later and it dropped by 10 ppm, I've just added more Cl and have the pump running 24 hours. I also brushed the sides and vacuumed the spa. I think I just might have any algae on the run. This is all odd though, as my pool was very clear even with the green umbrella receivers. I guess the algae was just lurking and ready to go.

    Again, many thanks.
    In ground, Pebbletec, free form pool with attached infinity spa. Total gallons, 11000 built approximately 2002-2003.
    Using Hayward XL pool sweep filtered through a Pentair CCP520, 4 cartridge filter, 3 inch return lines circulated by a 2HP Whisper pump.
    1.5 HP spa blower, Pentair Mini-Max Plus heater for spa and/or pool.

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    Jun 2013
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    Dunwoody, GA
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    Re: Algae starting?

    Sylvester similar thing happened to me, pool looked perfect, then when FC got too low, BOOM would get some algae on the walls, hardly noticeable but algae still the same, went through SLAM process. I later found there was algae behind the LED light cover
    Tallman Monterey (fiberglass), 16'x33', 11500 gallons, 480 sq/ft, Depth: 3' - 5' 6", Salt Water, TF-100, Pentair pump, sand filter, Easy Touch Control System, SWG

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    Join Date
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    Re: Algae starting?

    Quote Originally Posted by Richard320 View Post
    Yes, you can. But wait until AFTER the SLAM, otherwise your shock level will increase.

    Take a gander at Effects Of Adding Chemicals down near the bottom of poolmath. If you have your volume entered up top, down there it will tell you the amount of CYA added by each ounce of trichlor. Just figure out how many ounces you can use safely to raise the CYA to your target and use no more than that. When the least of 'em has dissolved, recheck your CYA.
    Thanks for all of the help. you were spot on!
    I had to slam for 48 hours, but the overnight drop in Cl was zero and no CC. I just adjusted the pH and the Cl is still about 9ppm, but it should drift down. I added one tab (floater) of Cl to increase my CYA and I plan to do a filter clean on Saturday. Thank you for helping me.
    In ground, Pebbletec, free form pool with attached infinity spa. Total gallons, 11000 built approximately 2002-2003.
    Using Hayward XL pool sweep filtered through a Pentair CCP520, 4 cartridge filter, 3 inch return lines circulated by a 2HP Whisper pump.
    1.5 HP spa blower, Pentair Mini-Max Plus heater for spa and/or pool.

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