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Thread: This doesn't make sense

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    Join Date
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    This doesn't make sense

    My return hose on the polaris 280 booster pump blew off. I think it was just loose, seems to be ok once I put it back on. The part that doesn't make sense to me is that the system backed up and blew DE into the pool. The booster is down stream from the filter.
    25000 gal IG gunite plaster. Built in spa, built 1984.
    48 SF Hayward DE-4800 filter
    1 hp Hayward super pump
    3/4 hp Polaris PB-4 booster pump, Polaris 380
    Taylor K-2006 test kit

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    mas985's Avatar
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    Re: This doesn't make sense

    Did the DE come out of the returns or the skimmer?

    It might of just been the pressure wave caused by the sudden release of pressure when the hose blew off.
    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

  3. Back To Top    #3

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    Re: This doesn't make sense

    It came out of the skimmer.
    25000 gal IG gunite plaster. Built in spa, built 1984.
    48 SF Hayward DE-4800 filter
    1 hp Hayward super pump
    3/4 hp Polaris PB-4 booster pump, Polaris 380
    Taylor K-2006 test kit

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    mas985's Avatar
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    Re: This doesn't make sense

    Yea, that was probably a back pressure wave. That can happen whenever there is a sudden change in pressure. But did the DE come out of the skimmer after you turned off the pump or while the pump was on?
    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

  5. Back To Top    #5

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    Re: This doesn't make sense

    Well, the report I get is that the DE was coming out when the pump was running right after the hose popped off. The pump was turned off and a little while later the timer kicked it back on and more DE came out. When I got to it later and repaired the hose and turned the pump on I didn't see any signs of DE coming out.

    Thanks for the response.
    25000 gal IG gunite plaster. Built in spa, built 1984.
    48 SF Hayward DE-4800 filter
    1 hp Hayward super pump
    3/4 hp Polaris PB-4 booster pump, Polaris 380
    Taylor K-2006 test kit

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    Mod Squad jblizzle's Avatar
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    Re: This doesn't make sense

    If the filter pump was running the entire time I can not imagine how DE could travel upstream out of the filter, backwards through the pump, and all the way to the skimmer ... i agree that does not make sense.
    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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    mas985's Avatar
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    Re: This doesn't make sense

    If the pressure wave was large enough, it could have forced the flow in reverse but the conditions have to be just right. This article can give you a feel for how large some of these waves can get:

    http://www.pumped101.com/waterhammer.pdf

    I am not saying this is what happened only that is possible. It is more likely that it was air in the filter that released when the pump shut off.
    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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