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Thread: Beginning of algae bloom?

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    Join Date
    Aug 2014
    Location
    Ottawa, Ontario
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    26

    Beginning of algae bloom?

    In the past week my pool water has been consistently cloudy. Brushing the bottom shows a fine brownish layer but water chemistry all looks to be good as far as I can tell (see below). Overnight loss of FC is <1ppm, I am attempting my first SLAM, keeping FC up at 15, running the filter continually and brushing twice a day. Is there anything else I should be doing? Is this likely to be algae?

    The water does not seem to have changed at all since starting 3 days ago, blue water but cloudy with some fine sediment at the bottom. I do live next to a fairly busy road so I thought at first it was just dirt being kicked up from the road accumulating since my cover has been off for a few weeks since it's been so hot.

    pH - 7.4
    TA - 90
    CH - 110
    FC - 4 (now at shock level of 15)
    CC - 0
    CYA - 30
    Pool size: 25000gal inground Vinyl
    Hayward eVAC pro
    Pentair Intellifow VS
    Jacuzzi Laser250 sand filter

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    Patrick_B's Avatar
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    Jun 2011
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    Midland TX
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    Re: Beginning of algae bloom?

    Sounds like it could be, but this will go fast for you with what you describe.
    TFP Moderator
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Mod Squad woodyp's Avatar
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    Apr 2010
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    Re: Beginning of algae bloom?

    I didn't see any mention of backwashing that filter. How old is it and could it possibly use a deep cleaning?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
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    Join Date
    Aug 2014
    Location
    Ottawa, Ontario
    Posts
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    Re: Beginning of algae bloom?

    I'm not sure how old it is, it came with the house we bought last summer and is the last piece of equipment we haven't replaced yet.

    I did backwash this evening but the pressure is still fairly high.
    Last edited by DJ13; 07-29-2015 at 08:20 AM. Reason: Added question
    Pool size: 25000gal inground Vinyl
    Hayward eVAC pro
    Pentair Intellifow VS
    Jacuzzi Laser250 sand filter

  5. Back To Top    #5

    Join Date
    Aug 2014
    Location
    Ottawa, Ontario
    Posts
    26

    Re: Beginning of algae bloom?

    Another question, is it safe to swim at shock levels of chlorine? My nephew is coming over during the day and my wife is wondering if it's still ok for him to swim? The pool is blue today but still not crystal clear, FC was at 14 this morning so lost very little overnight.
    Pool size: 25000gal inground Vinyl
    Hayward eVAC pro
    Pentair Intellifow VS
    Jacuzzi Laser250 sand filter

  6. Back To Top    #6

    Join Date
    Sep 2013
    Location
    Charleston, SC
    Posts
    535

    Re: Beginning of algae bloom?

    It is safe to swim if you are under shock level for you CYA and you can see the bottom of the pool. Sounds like you meet both of those criteria, so CANNONBALL!!!
    5900 G Fiberglass IG pool (circa 1990), SWG Hayward Aqua Rite GoldLine (2013), IntelliFlo Variable Speed Pump (2013), Hayward Pro Sand Filter (circa 1990), Well water (no iron or other metals fortunately), test with Taylor K2006C, Charleston, SC

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