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Thread: Submersible Pump Rate - Drain Pool

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    Submersible Pump Rate - Drain Pool

    Hi all, Unfortunately, I need to drain my pool in order to have an aquatic expert come in to perform an analysis on damage to our fiberglass shell. Does anyone know the hourly rate that a 1/3 HP submersible pump will remove water (via standard 3/4" garden hose output)? Thanks!
    10k gallon fiberglass freeform pool, Paramount SwingJet system, Dolphin DX5 robot, Pentair 48" Tagelus sand filter with glass media, WhisperFlo 1 HP pump, Hayward H200FDN natural gas heater, TF-100 Test Kit, and, of course, Margaritaville Tahiti blender!

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    Richard320's Avatar
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    Re: Submersible Pump Rate - Drain Pool

    I have a real cheapie and it's about 4 GPM. For me, that's about an inch an hour.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Isaac-1's Avatar
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    Re: Submersible Pump Rate - Drain Pool

    With these small pumps a lot depends on the height you are pumping the water too, if your pool were on a hill and your hose ran down hill to its ultimate destination, they act as sort of a powered siphon , on the other hand if pumping up to ground level they will start off ok, and get slower and slower as the water level drops. Reviewing a couple of typical 1/3 HP models, show published flow curves of around 50 gpm at 0 ft head, 42gpm at 5 ft head, and around 32 gpm at 10 ft head.

    Ike

    p.s. hose size may effect back pressure here, typical hoses range from 1/2 inch for cheap hoses, 5/8 inch for most better consumer hoses, and 3/4 inch for high quality contractor grade hoses. At any given pressure a 3/4 inch hose will flow about twice as much water as a 1/2 inch. In the real world the shorter and larger diameter the hose the better, with a 50 ft 3/4 inch hose you would likely get around 20-25 gpm in the real world, with a 1/2 inch hose those numbers drop considerably, likely below 10 gpm
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Submersible Pump Rate - Drain Pool

    hi all, thanks for the replies. i will be using a 3/4" hose and the run will be approx 100'. that said, it will be a flat run for about 20', then mostly downhill after that. i need to have it drained by Noon on Saturday, so was going to start tonight (Thursday) around 8:00 PM.
    10k gallon fiberglass freeform pool, Paramount SwingJet system, Dolphin DX5 robot, Pentair 48" Tagelus sand filter with glass media, WhisperFlo 1 HP pump, Hayward H200FDN natural gas heater, TF-100 Test Kit, and, of course, Margaritaville Tahiti blender!

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    thehowheels's Avatar
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    Re: Submersible Pump Rate - Drain Pool

    If you need faster, you can rent a 53 GPM submersible pump from Home Depot, with an industrial 2" x 50' hose for $50 / 24 hours.

    http://www.homedepotrents.com/proTools/ ... sible_pump
    Matt
    9k gallon, plaster, IG. Raised spa w/ spillover into pool. AO Smith Century Centurion / Purex Triton WisperFlo 0.5 HP, Hayward 1.5 HP (spa), Polaris 1-516-01 1.5 HP (blower). Hayward DE3620 36 ft2 72 GPM DE Filter, Polaris 145 cleaner. Pool built ~1980.
    Trouble-free, BBB since: April 25, 2013

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    Re: Submersible Pump Rate - Drain Pool

    thanks for the suggestion. by my calcs, even at 10 gpm, 10,000 gal would be 17 hours, so if i end up around 15-20 due to slope and size of hose, should be that must faster, yes?
    10k gallon fiberglass freeform pool, Paramount SwingJet system, Dolphin DX5 robot, Pentair 48" Tagelus sand filter with glass media, WhisperFlo 1 HP pump, Hayward H200FDN natural gas heater, TF-100 Test Kit, and, of course, Margaritaville Tahiti blender!

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