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Thread: Is this a Suitable Sump Pump to drain a pool?

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    Is this a Suitable Sump Pump to drain a pool?

    Is this a suitable pump to drain my pool?
    I found this pump at my local Home Depot.

    http://www.flotecpump.com/pdf/Pg_6_2006.pdf3200A

    Flotec 1/2 hp with float switch (auto/manual)
    model FPOS
    up to 3630 g/hr.

    I want to need to drain my pool but was not sure if this is the proper kind of sump pump to use. It is a "floor sucker" and can be manually operated.
    Ron DiLauro
    MasterSpa Envison Owner

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    JasonLion's Avatar
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    That would work. Keep in mind that that pump needs at least a 1 1/4" output pipe/hose.

    In many cases you can use your existing filter pump to drain the pool, even if you don't have a main drain. As long as you have an option to pump to waste, sand and DE filters almost always do but cartridge filters only occasionally do, it is possible to use the pool pump to drain the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Thanks,
    I have an older DE filter but I don't see a drain to waste. I can drain direct from the filter to a drain hose. Do I have to worry about heaving? I live in socal and there has been substantial rain recently. I think I can drain clean and refill the pool a day and a half. I will be replacing the old DE when I do the drain.
    Ron DiLauro
    MasterSpa Envison Owner

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    JasonLion's Avatar
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    Typically, with a sand or DE filter, when you put the filter on backwash it draws water in from the pool, through the filter, and sends it out to the drain hose (sometimes called waste). You can use that to drain the pool. If you have a main drain all you need to do is turn off the skimmers and the pool will drain from the main drain. If you don't have a main drain then you need to hook a manual pool vacuum hose up the a skimmer at one end and down at the bottom of the deep end at the other end and turn off any other skimmers. If you are doing this it is important that you not turn off the pump half way through or you will lose prime and not be able to get it back. Sometimes the vacuum hose leaks a little and that can sometimes cause a loss of prime. You can combat that by having a small pump or a garden hose feed a little water into the skimmer on top of the hose connection or vacuum plate. The water will seal any air leaks.

    You should never completely drain an in ground pool with a vinyl liner (above ground pools are normally safe to drain). The liner will tend to shrink a little and you will be unlikely to get it back into the correct position and it can rip. When the liner is very new the odds of getting it back in place are quite good, but after a couple of months it becomes markedly less likely. There are techniques to hold the liner in place, but they are too complex to explain here and not something most people will want to try.

    With a plaster/concrete or fiberglass pool you need to think about the water table. If the water table is above the bottom of the pool the pool can float up and cause significant damage to the plumbing and possibly crack apart. Usually the water table is below the pool and you will be fine. But if you figure wrong and the water table is high it can be very expensive to fix. Some pools have hydrostatic valves that equalize the water pressure, which means there can't be any damage (so long as the hydrostatic valve is still working). Others have well points around the pool. You can put a sump pump into each well point and pump the water table down to keep things safe.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Quote Originally Posted by newby12
    Thanks,
    I have an older DE filter but I don't see a drain to waste. I can drain direct from the filter to a drain hose. Do I have to worry about heaving? I live in socal and there has been substantial rain recently. I think I can drain clean and refill the pool a day and a half. I will be replacing the old DE when I do the drain.

    Just wondering... drain, clean and refill in a day and a half. What is it that you are cleaning or need to take out that you have to drain the pool?

    What Jason said about the water table is absolutely true.

    Can you tell us alittle more about what kind of pool you have and why you want to drain the water out of it?
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

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