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Thread: cleaning out algae

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    Join Date
    Mar 2013
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    Houston, TX
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    cleaning out algae

    We've spent the past week killing algae in our swimming pool. We've installed a new filter (Hayward ec65) and are at the point to vacuum out the dead algae from the bottom. The problem we're currently having is the amount of algae at the bottom of the pool is clogging the filter in minutes. Can we leave the clean out valve open while vacuuming the algae out? Or are there any other reasonable options? Or are we stuck bumping and draining til it's clean?!
    [center]idk the size of my pool.... but it's in ground gunite/plaster. We just got a DE filter after fighting with our cartridge filter last year. the pump is 1 1/2 hp... We had it re-plastered last year but its already a swamp again :(
    ~~~Laura~~~

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    Re: cleaning out algae

    If the algae is sludgy enough, you might try a leaf rake (fancy name for a mesh bag with a hoop that fits on the pole). The next option is to vacuumm to waste, if you have one of those fancy multiport valves installed. The pump will suck the stuff up and spit it out without it going near the filter.

    NO, you can't vacuum on backwash - all you'll do is clog the screens from the inside. So vacuum, backwash, vacuum, backwash. Remember to only add about 80% of the DE after the backwash, unless you break the filter down and thoroughly clean the grids.
    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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    Mar 2013
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    Houston, TX
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    Re: cleaning out algae

    We tried the leaf rake and it doesn't do much. So slow go it's going to be darn the luck. Okay and if anyone has any helpful quick tips I'll take it!
    [center]idk the size of my pool.... but it's in ground gunite/plaster. We just got a DE filter after fighting with our cartridge filter last year. the pump is 1 1/2 hp... We had it re-plastered last year but its already a swamp again :(
    ~~~Laura~~~

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
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    May 2010
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    Tucson, AZ
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    37,389

    Re: cleaning out algae

    Add a 3-way valve between the pump and filter. Then you can effectively have a way to vacuum to waste.

    Whether or not doing that plumbing is quicker or not depends on your skill level
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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