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Thread: Single speed pump on waterfall

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    Single speed pump on waterfall

    Does anyone know if there is a device to convert a single speed pump to variable...like a dimmer? I have a waterfall and sometimes want to slow down the pump so water dribbles down the rock face of my wall.....looks really nice. I know this, because when the leaves start falling or the pump looses prime, the pump slows down.
    Thanks in advance.
    Heinsite
    17500 pool/spa iAqualink Rev R, Pentair DE Filter, Waterfall, 3900 Polaris Cleaner, Goldline Saltwater Gen. w/t15, Rayvac 40,000 Gas heater, Taylor K-2006 Test Kit, Taylor Saltwater Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Single speed pump on waterfall

    No such thing. The motors are not designed that way. You can add a valve after the pump and partially close it to reduce the amount of flow however.
    Jason, TFP Moderator
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    Re: Single speed pump on waterfall

    So does restricting water add strain to the motor? (obviously, no water burns up the impeller)? Thanks for the reply
    Heinsite
    17500 pool/spa iAqualink Rev R, Pentair DE Filter, Waterfall, 3900 Polaris Cleaner, Goldline Saltwater Gen. w/t15, Rayvac 40,000 Gas heater, Taylor K-2006 Test Kit, Taylor Saltwater Test Kit

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    mas985's Avatar
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    Re: Single speed pump on waterfall

    Actually it is just the opposite. The more head loss in the system and the lower the flow rate, the lower the load on the motor.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Single speed pump on waterfall

    Adding a valve after the pump is the way to go.

    There are remote actuated valves that could accomplish what you want.
    The Original Leak Specialists.

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    Re: Single speed pump on waterfall

    I have a three way valve before pump, would it damage the pump restricting inflow there?
    Heinsite
    17500 pool/spa iAqualink Rev R, Pentair DE Filter, Waterfall, 3900 Polaris Cleaner, Goldline Saltwater Gen. w/t15, Rayvac 40,000 Gas heater, Taylor K-2006 Test Kit, Taylor Saltwater Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Single speed pump on waterfall

    You do not want to restrict it before the pump ... Why is there a valve before the waterfall pump?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Single speed pump on waterfall

    Not sure why a valve, but feeder from Pool to valve (obviously) then one to the pump and the return to the waterfall which has a leg back to the valve. New questions as I am having trouble priming...replaced O rings on valve, opened and re-magic lubed the basket and freeze plug...opened the fuser and inspected the impeller which was clogged with debris and a plastic shard (blue, misc. piece) in the impeller. ONE of the back fins is broken on the impeller, will this keep it from priming and pumping?
    Heinsite
    17500 pool/spa iAqualink Rev R, Pentair DE Filter, Waterfall, 3900 Polaris Cleaner, Goldline Saltwater Gen. w/t15, Rayvac 40,000 Gas heater, Taylor K-2006 Test Kit, Taylor Saltwater Test Kit

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    mas985's Avatar
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    Re: Single speed pump on waterfall

    Quote Originally Posted by Heinsite
    ONE of the back fins is broken on the impeller, will this keep it from priming and pumping?
    Yes and it could damage the pump motor as well because of the imbalance it will cause so you might want to repair that ASAP.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Single speed pump on waterfall

    Ok, just ordered one...Thanks again for all the help
    Heinsite
    17500 pool/spa iAqualink Rev R, Pentair DE Filter, Waterfall, 3900 Polaris Cleaner, Goldline Saltwater Gen. w/t15, Rayvac 40,000 Gas heater, Taylor K-2006 Test Kit, Taylor Saltwater Test Kit

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