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Thread: Can't get rid of Algea

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    Can't get rid of Algea

    Hi All. So i'm a huge fan of the BBB method. I evengot two of my neighbors to use it. Last year my pool stayed crystal clear the entire season with ver minimal maintenance or expense. This year, however, i'm having a really hard time with Algea. I can't seem to get rid of it. YES my pool is properly balanced (my CC has been 0 or very close to that; PH 7.6; TA 80; CH 110). My FC has been fluctuating with based on CNY. The CNY is currently at 45 and i'm aiming for FC of 4.
    I find that i keep getting algea growths, I shock and get rid of it and then it comes right back a few days later.
    I have a Hayward sand filter which i usually backwash every week or two as pressure builds. However, this entire season the pressure has never raised and slowed down the flow. (I have backwashed a couple of times after shocking, but not because of pressure drops) Why would that be?? Could that have anything to do with my algea problem?
    Any help or advice would be greatly appreciated as i'm at my wits end and even considering going to the pool store
    18K gallon in-ground, vinyl. Hayward 200lb. sand filter. Hayward 1hp pump. Taylor K-2006 test kit. BBB method.

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    bobodaclown's Avatar
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    Re: Can't get rid of Algea

    You need to keep your FC Higher. Your CYA level might be higher than you think. You need to SLAM then maintain a higher FC level.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Mod Squad JVTrain's Avatar
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    Re: Can't get rid of Algea

    When you say aiming for and FC of 4 do you mean that's what you bring it up to after testing? At a CYA of 45, treat it like it's 50 so minimum FC is 4 your target for when you add bleach is to get to 6. It should NEVER drop below 4.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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    pwrstrk's Avatar
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    Can't get rid of Algea

    IMO you should be targeting 7-8 and never below 4. That will give you some more room for burn off of FC so you don't fall below your min.
    Also when you SLAM the pool are you going to all three criteria are met ? SLAM Process
    1 water is crystal clear
    2 CC of 0.5 or less
    3 pass the OCLT
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Can't get rid of Algea

    Quote Originally Posted by pwrstrk View Post
    IMO you should be targeting 7-8 and never below 4. That will give you some more room for burn off of FC so you don't fall below your min.
    Also when you SLAM the pool are you going to all three criteria are met ? SLAM Process
    1 water is crystal clear
    2 CC of 0.5 or less
    3 pass the OCLT
    Appreciate that tip. I will target the high end of the range. And yes I have been maintaining slam until all three items passed.

    - - - Updated - - -

    Anyone have any suggestions as to why my filter never losses pressure? Does that mean I need to change the sand? Could it have anything to do with my algae problem?

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    Mod Squad tim5055's Avatar
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    Re: Can't get rid of Algea

    Quote Originally Posted by ari View Post
    Anyone have any suggestions as to why my filter never losses pressure? Does that mean I need to change the sand? Could it have anything to do with my algae problem?
    It never looses pressure because it is still filtering the water fine.

    There are very few reasons to change the sand - like a conversion from Baqua to chlorine. Other than that it doesn't wear out.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Can't get rid of Algea

    So it's possible to run a sand filter many weeks without ever needing a backwash?

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    Re: Can't get rid of Algea

    I did my first backwash last week with my new sand filter 4 weeks after installation. It didnt really need it but i wanted to add DE so i wanted to start out clean.
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

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    Kiss4aFrog's Avatar
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    Re: Can't get rid of Algea

    You also have it backwards. The filter will not lose pressure but gain pressure as it starts to clog up. You should wait until the pressure rises 20-25% over the clean pressure before backwashing. If your pool is dirty that could be every hour or two at the beginning of a SLAM on a green monster or it could be weeks or even a month or more if the water is clean and there isn't much "stuff" brought in by swimmers or blown in with the wind.
    What some people don't know is that a slightly dirty filter works better than clean one. That dirt plugs it up a bit and thus helps it filter out smaller stuff. That's why you don't want to be constantly backwashing your filter unless the pressure is telling you to.

    Pool School info on filter maintenance http://www.troublefreepool.com/conte...er-maintenance
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    Mod Squad JVTrain's Avatar
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    Re: Can't get rid of Algea

    Last time I Backwashed was June 7th... 14 to 16 psi since then and the DE I added at 14 brought it to 15.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Can't get rid of Algea

    Wow I did not know that. Thanks all for your help. I will keep up the slam until my water is crystal clear (and I pass the other two tests). And keep my FC levels a bit higher and hopefully the algae doesn't come back.

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    Re: Can't get rid of Algea

    Just hang in there Ari, it will make it.. its going to take some patients. You can beat this. If it starts wearing you down, come back here and post your frustrations and someone will help pick your spirits back up. We all want you to succeed.
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

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    Re: Can't get rid of Algea

    Quote Originally Posted by one_knight4u View Post
    Just hang in there Ari, it will make it.. its going to take some patients. You can beat this. If it starts wearing you down, come back here and post your frustrations and someone will help pick your spirits back up. We all want you to succeed.
    Thanks for the encouragment. It actually goes a long way.
    18K gallon in-ground, vinyl. Hayward 200lb. sand filter. Hayward 1hp pump. Taylor K-2006 test kit. BBB method.

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    Re: Can't get rid of Algea

    You are very welcome. All through my life it seemed like someone was always there to encourage me when I had lost hope. Its my way of giving back to keep the circle going. Someday you will encourage someone who needs it and thus the circle keeps going.
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

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