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Thread: PSI loss between filter and pentair pop up dome? What's normal

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    PSI loss between filter and pentair pop up dome? What's normal

    My filter is currently at a rather cosistent 30 PSI, even after cleaning my filters it ranges from 25-30 PSI. At the dome its reading 10-20 PSI and I "think" i'm having an issue with weak pressure on some pop up valves.


    What is the normal pressure drop between the filter and dome?

    Thanks.
    Size of pool (gallons) = 15,000
    Pool Type: is IG (in ground)
    Construction: Plaster
    Filter type: DE
    Filter Manufacturer: SM/SMBW 2000 Series
    the size, model number or flow rate of the filter.
    Pump in HP = 2
    Pump is two speed
    Date of pool build/install = circa 2001
    with spa

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    Melt In The Sun's Avatar
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    Re: PSI loss between filter and pentair pop up dome? What's normal

    Is there a valve to direct water to the popups? If you are only sending a little water to them, they won't be very strong, but I can't put a number on a pressure difference. Are you sure the gauges are good? What kind of "weak pressure" symptoms are you having?
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Mod Squad jblizzle's Avatar
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    Re: PSI loss between filter and pentair pop up dome? What's normal

    It is pretty normal I think to see a difference, not sure how much though. The filter is measuring the pressure before the filter grids, the dome is measuring the pressure after the filter grids plus there is head loss through the plumbing from the filter to the dome.
    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: PSI loss between filter and pentair pop up dome? What's normal

    30 PSI is pretty high and close to the max for many pumps. What is your pump make/model? Does your filter gauge go to zero when the pump is 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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    Re: PSI loss between filter and pentair pop up dome? What's normal

    Hi there isn't a make/model on the pump for some reason but it's a 2 HP single speed pump.

    Right now the pressure is high and the pop up cleaners are not rotating correctly, zone 1 is staying active resulting in weak pressure on the rest of the system and zone one isn't rotating since its staying active. I had a pool service come by today, he recommended new filters and a new gear for the zodiac caretaker system. The filters are from 2007 presumably when the pool was built.
    Size of pool (gallons) = 15,000
    Pool Type: is IG (in ground)
    Construction: Plaster
    Filter type: DE
    Filter Manufacturer: SM/SMBW 2000 Series
    the size, model number or flow rate of the filter.
    Pump in HP = 2
    Pump is two speed
    Date of pool build/install = circa 2001
    with spa

  6. Back To Top    #6
    Melt In The Sun's Avatar
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    Re: PSI loss between filter and pentair pop up dome? What's normal

    If you open up the dome, the gears should rotate easily if you spin them with your finger. It is easy to replace yourself if something is broken/worn/missing.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: PSI loss between filter and pentair pop up dome? What's normal

    Quote Originally Posted by Melt In The Sun View Post
    If you open up the dome, the gears should rotate easily if you spin them with your finger. It is easy to replace yourself if something is broken/worn/missing.
    Thanks, I'll open the dome up today and take a look at it. Something has to be off. I see they have rebuild kits for about $75 online.
    Size of pool (gallons) = 15,000
    Pool Type: is IG (in ground)
    Construction: Plaster
    Filter type: DE
    Filter Manufacturer: SM/SMBW 2000 Series
    the size, model number or flow rate of the filter.
    Pump in HP = 2
    Pump is two speed
    Date of pool build/install = circa 2001
    with spa

  8. Back To Top    #8

    Join Date
    Oct 2013
    Location
    Phoenix, AZ
    Posts
    25

    Re: PSI loss between filter and pentair pop up dome? What's normal

    I ended up replacing the internals of the polaris caretaker system with the rebuild kit. It did NOT resolve my problem though. I still have the jets at the deep end of the pool stuck in the on position and the system is not cycling. Any idea what else could cause this problem?
    Size of pool (gallons) = 15,000
    Pool Type: is IG (in ground)
    Construction: Plaster
    Filter type: DE
    Filter Manufacturer: SM/SMBW 2000 Series
    the size, model number or flow rate of the filter.
    Pump in HP = 2
    Pump is two speed
    Date of pool build/install = circa 2001
    with spa

  9. Back To Top    #9

    Join Date
    Oct 2013
    Location
    Phoenix, AZ
    Posts
    25

    Re: PSI loss between filter and pentair pop up dome? What's normal

    Problem with jets not cycling has been fixed. The check valve was stuck open somehow. I removed it, cleaned it and re-installed and now everything is cycling fine.

    I'm put in new cartridge filters and a new internal rebuild kit on the caretaker, however my PSI is still at 28-30. I'm wonder in that is just normal with a 2hp pump running?
    Size of pool (gallons) = 15,000
    Pool Type: is IG (in ground)
    Construction: Plaster
    Filter type: DE
    Filter Manufacturer: SM/SMBW 2000 Series
    the size, model number or flow rate of the filter.
    Pump in HP = 2
    Pump is two speed
    Date of pool build/install = circa 2001
    with spa

  10. Back To Top    #10
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
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    Re: PSI loss between filter and pentair pop up dome? What's normal

    What is the pressure at the dome? It should have a gauge.
    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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