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Thread: Dead algae or undissolved chemical?

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    Join Date
    Jul 2012
    Location
    Toronto, Canada
    Posts
    9

    Dead algae or undissolved chemical?

    I've been working on turning my algae into a sparkling oasis... been shocking and brushing for a few days now. The water is clear (see through, no green or cloudy) by the end of the day but with grey dusty/dirty stuff on the bottom. When I brush it all up in the evening the water gets all cloudy again.

    How do I know if it is dead algae or undissolved shock? I've been using calcium hypochlorite (yes, I know I shouldn't be but I am for the moment). I don't want to vacuum it out if it's actually chemical doing its business.

    My test kit is on its way here so I can't do an overnight test or anything to check FC accurately at the moment.
    100,000 L (26,400 gallons) rectangular IG vinyl pool, sand filter, pool ~15 years old, new liner 2010, full sun 90% of the day, TF100 kit.

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    Vette's Avatar
    Join Date
    Jul 2012
    Location
    Ohio
    Posts
    404

    Re: Dead algae or undissolved chemical?

    Pick some up, undissolved Cal Hypo is just going to be the white round beads, while algae will be slimy.
    11,700 gallon 21' round 54" deep all-resin AGP - June 2012
    Waterway 1HP 2-speed pump / 100 sq ft cartridge filter
    Hayward 150,000btu Natural Gas heater
    I use and recommend the TF-100 for testing

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: Dead algae or undissolved chemical?

    (yes, I know I shouldn't be but I am for the moment). I don't want to vacuum it out if it's actually chemical doing its business.
    Well, if you know you shouldn't be, then you really shouldn't be. Cal Hypo, left on a vinyl liner will bleach out the liner in many. many cases. I suggest you vacuum it into your filter ASAP
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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