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Thread: Green algae / cloudy water .. completely drain and refill?

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    Turbota's Avatar
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    Green algae / cloudy water .. completely drain and refill?

    About a week ago I was at the local pool supplies store when some lady walked in and told of her problems to one of the sales guys.

    It appears that she has an in-ground gunite pool with green algae and now cloudy water on top of that. She was there to buy more chemicals. Seems she has been fighting this problem for quite some time.

    Anyway, I am no expert, but I suggested to her that it might be easier just to drain the whole pool completely and start all over with new water.

    She looked at me like I was crazy .... Did I give her bad advice?

    Ron,
    9,000 gal. in-ground concrete pool
    Sta-Rite Max-E-Pro pump and motor (1 HP)
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    Mod Squad jblizzle's Avatar
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    Re: Green algae / cloudy water .. completely drain and refil

    Draining an inground pool can be risky ... especially in your area where the ground water level is likely close to the surface. If the ground water gets to be above the pool water level, the pool can actually float out of the ground.

    There are ways around that issue like the tarp method that has been used successfully to replace water without actually draining the pool.

    That also may not be the most cost effective method of solving the water problem ... depends on the problem and the cost of water.

    HOWEVER, given that she was at a pool store for advice, clearly she did not know what she was doing and it likely would have been cheaper to drain and start over
    Jason, TFP Moderator
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    duraleigh's Avatar
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    Re: Green algae / cloudy water .. completely drain and refil

    She looked at me like I was crazy .... Did I give her bad advice?
    Don't drain a pool to get rid of algae....it doesn't work. The conditions that caused the algae the first time will still exist and the algae will come right back.

    Better advice would have been to tell her to come to TFP and learn (up in Pool School) how her pool got there in the first place so she can change her management practices.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Turbota's Avatar
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    Re: Green algae / cloudy water .. completely drain and refil

    Quote Originally Posted by jblizzle

    Draining an inground pool can be risky ... especially in your area where the ground water level is likely close to the surface. If the ground water gets to be above the pool water level, the pool can actually float out of the ground.
    I had no idea! ... Now wouldn't that be a horrible thing to deal with!
    9,000 gal. in-ground concrete pool
    Sta-Rite Max-E-Pro pump and motor (1 HP)
    Pentair CC100 cartridge filter (100 sq ft)
    Zodiac MX8 suction pool cleaner

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    Mod Squad jblizzle's Avatar
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    Re: Green algae / cloudy water .. completely drain and refil

    There are a few threads on the forum with pictures of people dealing with it ... not a good situation.

    Although I have to agree with Dave as well. Just drain and fill will still leave algae hiding that will continue to grow back if the chemistry is not kept correct ... likely a little easier to kill though if you actually follow the shock process.
    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
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    Mod Squad JohnT's Avatar
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    Re: Green algae / cloudy water .. completely drain and refil

    Algae is easy to get rid of, and draining water won't help. People go to the pool store because they want a magic bullet to instantly fix the problem, and there is no such thing.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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