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Thread: Brand new DE Grids/Still green algae

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    Brand new DE Grids/Still green algae

    OK so I was taking care of a friends pool and they wanted to save by having me do it every other week. Finally told them NO, all or nothing. Got algae cleaned up (so I thought) and also was finding DE coming back into system. Had torn and broken grids. Cleaned grids while waiting for new ones to arrive. 4 days later went to put new grids in and old ones were covered with green algae again. Figured after putting in new grids, cleaning EVERYTHING I could see and recharging the system I should be good to go. It has been 2 weeks now and I still am getting green in the pool. Chemical and numbers are all good. I have brushed, vaccumed and backwashed constantly. I cleaned the returns, skimmer and lights. Is there something, somewhere I am missing that could still be holding onto some algae????
    5,000 gal Fiberglass paper cartridge filter, autochlorinator, BBB
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    15,000 gal Pebble Tec, DE filter, autochlorinator, BBB
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    Mod Squad jblizzle's Avatar
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    Re: Brand new DE Grids/Still green algae

    Algae is a chemistry issue, not a filter issue. Post up a full set of test results and let us judge "good".

    You need to follow the SLAM process to clear the algae.
    Jason, TFP Moderator
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    Re: Brand new DE Grids/Still green algae

    I have SLAMMED it
    5,000 gal Fiberglass paper cartridge filter, autochlorinator, BBB
    20,000 gal Pebble Tec paper cartridge filter, BBB
    15,000 gal Pebble Tec, DE filter, autochlorinator, BBB
    20,000 gal Pebble Tec, sand filter, BBB

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    Mod Squad jblizzle's Avatar
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    Re: Brand new DE Grids/Still green algae

    If the water is not clear then you should not have stopped the SLAM process. Can you confirm you followed the SLAM process defined in Pool School?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Brand new DE Grids/Still green algae

    Yes I followed your technique and the water was and is clear. Finding the green on some walls, ports and floor. Not completely covered but in a few of these areas. After brushing, vacuuming I backwash and the water is green. I run it till it clears then add more DE. I have increased the flow of the auto chlorinator.
    5,000 gal Fiberglass paper cartridge filter, autochlorinator, BBB
    20,000 gal Pebble Tec paper cartridge filter, BBB
    15,000 gal Pebble Tec, DE filter, autochlorinator, BBB
    20,000 gal Pebble Tec, sand filter, BBB

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    Mod Squad jblizzle's Avatar
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    Re: Brand new DE Grids/Still green algae

    If you see algae, you are not done with the SLAM or need to do it again.

    Post up test results. It is clear that you are not maintaining the FC high enough for your CYA level if algae is growing. And the mention of a chlorinator makes me even more suspect.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Mod Squad tim5055's Avatar
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    Re: Brand new DE Grids/Still green algae

    Quote Originally Posted by jblizzle View Post
    It is clear that you are not maintaining the FC high enough for your CYA level if algae is growing. And the mention of a chlorinator makes me even more suspect.
    +1

    Unless that auto chlorinator is a stenner or liquidator you are pushing up the CYA. High CYA - too low FC = algae.
    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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