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Thread: Pool water clear but algae on sides

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    Pool water clear but algae on sides

    Just got back from vacation. the pool walls had some algae on them but the water is clean. i have a basic test kit and here are my numbers,.

    tc 3
    fc 3
    cya 80
    ph 7.5
    alkilinity 70
    ch 110
    salt 3400

    31000 gallon pool 18 by 36 with 4 foot roman ends on each side. mod media filter, swg, no water falls or deck jets vynyl liner..
    why would i be getting algae on the sides.??

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    Mod Squad jblizzle's Avatar
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    Re: Pool water clear but algae on sides

    Welcome to TFP!!!
    Quote Originally Posted by SALTPOOL
    why would i be getting algae on the sides.??
    Easy, because your FC got too low.
    According to Pool School in This Chart, the MINIMUM the FC should be with a SWG and a CYA at 80ppm, is a FC of 4ppm.

    You need to SLAM the pool. [slam:1rk72ybh][/slam:1rk72ybh]

    This is done with the SWG off and you WILL need one of the Recommended Test Kits.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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