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Thread: Why can't we filter live algae, only dead?

  1. Back To Top    #1
    Kes's Avatar
    Join Date
    Apr 2010
    Worcester UK

    Why can't we filter live algae, only dead?

    Just having come through a massive algae attack, I am pondering why can't we filter live green algae, only the dead
    grey stuff?

    When the pool was a deep British Racing Green I had my sand filter filtering 24/7 and in the morning backwash there would be a derisory amount of green algae removed, just enough to give me a mixture of encouragement and dismay. After hard shock treatment, with the water turning a pale grey-green, the morning backwash removed a ton of grey gloop. (I am now mercifully sparkly clear.)

    So why isn't the green algae filtered to any appreciable extent? It doesn't get larger when it dies, does it? And it isn't that it is constantly being replaced, as more would be caught in the filter.

    I did use cal-hypo to shock (bleach is another story) but I can't see that being the cause of the grey stuff.
    11,000 Imp galls inground hopper 15' x 35', Delifol liner (vinyl), sand filter, Abrisud Classic cover, Palintest 315C test kit

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: Why can't we filter live algae, only dead?

    It is filtered when it's live, you just can't filter faster than it grows in the pool.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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