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Thread: Bump Handle Question

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    Bump Handle Question

    What is actually happening when you lower and raise the bump handle on a D.E. filter to lower the psi? I imagine that it is releasing some of the D.E. or other sediments from the tentacles/fingers but why this would have an effect on the psi i can't figure out. Just a question of curiosity really.
    12,500 Gal In Ground Plaster, Zodiac lm2-24 SWG, Cartridge Filter, Attached spa, Waterfall, Phoenix AZ

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    Re: Bump Handle Question

    It re-arranges the individual DE particles exposing some that may not yet be caked up with gunk, giving you a bit more filtering ability and improving water flow.

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    In the Industry

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    Re: Bump Handle Question

    What exactly do you mean by "lower and raise the bump handle" ???? are you not backwashing it?
    http://www.californiapoolsdirect.com serving Dallas pools since 1953!

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    Re: Bump Handle Question

    My dad's old DE filter had bump capability. If pressure rose, you turned the pump off, bumped the grids which essentially washed all the DE off them, then when you restarted the pump the DE would redistribute. Only when this didn't lower pressure would he backwash.

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    Re: Bump Handle Question

    Quote Originally Posted by Rangeball
    My dad's old DE filter had bump capability. If pressure rose, you turned the pump off, bumped the grids which essentially washed all the DE off them, then when you restarted the pump the DE would redistribute. Only when this didn't lower pressure would he backwash.

    exactly...there aren't many of those bump style filters left on pools.....so my wonder is does the OP have a bump style filter or a newer style filter and valve. i hear people refer to backwashing as "bumping" often.
    http://www.californiapoolsdirect.com serving Dallas pools since 1953!

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    Re: Bump Handle Question

    Hayward still sells a bump style DE filter, I just bought one a couple of years ago, works great for me ( model EC-75) . The old ones had a bump knob like handle, the current ones use a lever arm handle. My understanding is it knocks most of the DE off the fingers and then when you turn the water back on the fingers are recoated with the DE in a fresh orientation somewhat refreshing its ability to filter. The only potential problem I see with this design is the finger tubes, and the fact that replacement tubes seem to sell for almost as much as the entire filter assemble. (I suspect Hayward as a higher markup percentage on parts than on compete products). From what I have read online much of the problems people have with these types of filters stems from not following the directions, and not bump cleaning or DE replacement when needed causing pressure to build up too much and blow out the fingers.

    Ike

    p.s. Mine shipped with a pressure gauge that has a pair of turnable indicator needles, one reg one green 10 PSI apart, you set it
    with the first needle at your base pressure after fresh coating, when the pressure rises to the second needle you know when to bump. The included instruction manual just shows a standard pressure gauge and notes to bump when you have 10 psi rise over base pressure. I guess this is part of Hayward's way of making the operation easier, seems like a good idea to me, better would be an electronic pressure transducer with warning lights to tell when to bump and when to replace DE because bumping was no longer lowering pressure enough, but I guess a little bit plastic is cheaper..
    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: Bump Handle Question

    Welcome to TFP!!


    You might want to give Pool School a good read and check out Use and Care for DE filters in the 'further reading' section.

    If you still have questions, we're more than happy to help you
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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