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Thread: Algae fight help

  1. Back To Top    #1

    Join Date
    Apr 2016
    Location
    East grand forks, mn
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    2

    Algae fight help

    hello I'm new to the site and second year owning a 20 x 40, 30k gal, in ground chlorinated pool. We run a sand filter and propane heater. We live in northern Minnesota.
    We cover the pool with the mesh style cover. Two weeks ago we opened to a very green swamp the water. I replaced the sand in the filter prior to starting circulation, got circulation going, brought FC level up to shock level and have held it there for nearly 14 days and water is not clear. I have used muriatic acid liquid chlorine and when first treating with the chlorine added some copper based algicide that I had on the shelf which I believed caused the foaming that we experienced for several days but has since subsided.
    PH is been maintained between 7.0 and 7.3, TA started at 110 now maintaining 80. FC has been held at 32 or greater sense April 25. CC has been .5 or zero throughout consistently .5 the last six days in a row.CYA started at 80 and is now 60 and has not improved in six days.
    I am using the TF 100 kit.
    my concern is that the clarity has seem to stop improving.
    I also run a pool robot is constantly as possible with working family and such.
    any advice would be greatly appreciated! Thank you and advance we're all looking forward to warming up the water and jumping in!

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
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    Apr 2010
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    Re: Algae fight help

    Algaecide probably caused your foaming and we don't recommend using it. Leave your CYA at 60 if you are trying to go higher. There was no need to replace your sand btw. Have you back washed the filter any over 14 days? Welcome!
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  3. Back To Top    #3

    Join Date
    Apr 2016
    Location
    East grand forks, mn
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    Re: Algae fight help

    Last fall the filter had shown signs of needing new sand so I had planned on replacing the sand any way.
    I did figure that the algicide caused the foam. Thanks.
    i do backwash regularly.
    why the stand still with the water clearing up?

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
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    Aug 2012
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    Re: Algae fight help

    Are you letting the filter pressure rise 25% before backwashing? Sometimes a little dirt in the filter helps it to catch more stuff. If the filter isn't getting dirty or building up pressure over a couple of days then you can add a little DE to help it filter better. Here's how, Pool School - Add DE to a Sand Filter
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