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Thread: Back wash var pump speed

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    Back wash var pump speed

    probably a newbie question... i have a 28,000 gallon pool with the largest pentair sand filter and the pentair var speed pump. The plumbing is 2" on the waste line and 2" on the suction lines.

    early spring i was having to back wash every few days from all the pollen and other junk getting into the pool. when i backwash i put the pump at the max speed which i believe is right around 3500 rpm. let it run for around 2 minutes, then rinse for 30 seconds at max speed.

    At this speed I feel like I can almost see the fill line in my pool lower by the minute.

    For those with var speed pumps, what speed do you typically back wash?

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    mas985's Avatar
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    Re: Back wash var pump speed

    You shouldn't need to backwash at an rpm any higher than what you use for normal filtering.
    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: Back wash var pump speed

    Quote Originally Posted by mas985 View Post
    You shouldn't need to backwash at an rpm any higher than what you use for normal filtering.
    When we aren't using the pool I run the pump at 1500 rpm. When we are using it and slide and deck jets are on I go to 2500 rpm



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    CJadamec's Avatar
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    Re: Back wash var pump speed

    Since you should be turning the pump off when you move the handle on the multi port valve I just let the pump backwash the filter at it's self-priming speed. Shut the pump off again do the same for the rinse cycle. Shut the pump off again then put it back to filter and walk away.
    Chuck-
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    Zappafan's Avatar
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    Re: Back wash var pump speed

    One thing I have found that captures the pollen really well is plain old skimmer socks or nylons if you just can't bring yourself to walk into the pool store. Their cheap and work really well. And yes I can too watch my water line drop when backwashing. I love rain!

    17K Gallon,IG Vinyl,1hp Pentair Challenger,Pentair TA60 Sand Filter, Hayward Colorlogic,Re-lined 06-20-15, TF-100,SpeedStir,Lagunitas and Margaritas. Zappafan Pool Build

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    mas985's Avatar
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    Re: Back wash var pump speed

    Quote Originally Posted by andyjenkins View Post
    When we aren't using the pool I run the pump at 1500 rpm. When we are using it and slide and deck jets are on I go to 2500 rpm
    Then I would backwash at 2500 RPM. The higher the RPM, the higher the flow rate and the more embedded the dirt will become.
    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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