Become a TFP Supporter Welcome to our new server and new forum software. If you have problems logging in to the new system, you should try resetting your password. Click HERE to do that. Pool School
Results 1 to 9 of 9

Thread: Filter Pressure Drop

  1. #1
    Senior Member SPKNout4CHRIST's Avatar
    Join Date
    Mar 2011
    Location
    Goldsboro, NC
    Posts
    181

    Filter Pressure Drop

    I noticed yesterday that my filter pressure has dropped from its usual PSI of about 15 down to 10. I made sure the skimmer baskets and the pump basket are clear and they are. I isolated each of the skimmers and the main drain to see if that made any difference and it did not. I bled the air in the filter with no change. The returns and the water in the pump basket seem to be normal.

    I did notice that the top edge around the basket in the pump is cracked almost all of the way around (I will be getting a new one). Would that cause any issues? Any other ideas?

    God bless and thanks in advance!!
    22,600 gal. Vinyl Inground
    FNS Plus 60 DE Filter
    WhisperFlo 1HP Pump
    MiniMax NT Heater
    Mineral Springs MS-10 System

  2. #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    3,043

    Re: Filter Pressure Drop

    Do you have bubbles in the pump basket strainer or coming from your return?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    1.5 hp Speck pump 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  3. #3
    Senior Member SPKNout4CHRIST's Avatar
    Join Date
    Mar 2011
    Location
    Goldsboro, NC
    Posts
    181

    Re: Filter Pressure Drop

    Just two bubbles in the top of the pump basket strainer, but I have always had those there. None coming from the returns once I bled the filter.
    22,600 gal. Vinyl Inground
    FNS Plus 60 DE Filter
    WhisperFlo 1HP Pump
    MiniMax NT Heater
    Mineral Springs MS-10 System

  4. #4
    Senior Member mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    5,637

    Re: Filter Pressure Drop

    Did you recently do any vacuuming? Lower pressure can be caused by a partially clogged impeller.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Paper
    18'x36' 20k gallon plaster/gunite pool, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge Filter, 450 sq-ft EPDM Solar Panel, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  5. #5
    Senior Member Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    7,193

    Re: Filter Pressure Drop

    Tap on the gauge with your fingernail a few times, see if it moves.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  6. #6
    Senior Member SPKNout4CHRIST's Avatar
    Join Date
    Mar 2011
    Location
    Goldsboro, NC
    Posts
    181

    Re: Filter Pressure Drop

    Quote Originally Posted by mas985
    Did you recently do any vacuuming? Lower pressure can be caused by a partially clogged impeller.
    Not too recently. There hasn't been a lot going into the pool to vacuum, thankfully!


    Quote Originally Posted by Richard320
    Tap on the gauge with your fingernail a few times, see if it moves.
    I will give that a shot this evening.
    22,600 gal. Vinyl Inground
    FNS Plus 60 DE Filter
    WhisperFlo 1HP Pump
    MiniMax NT Heater
    Mineral Springs MS-10 System

  7. #7
    Senior Member SPKNout4CHRIST's Avatar
    Join Date
    Mar 2011
    Location
    Goldsboro, NC
    Posts
    181

    Re: Filter Pressure Drop

    Okay, tapping on the gauge did not change anything.

    There are some small bubbles coming out the returns by the steps. These are not like the bubbles that come out the return due to the SWG, but more like small air bubbles.

    I have also noticed that the filter is building up air and I need to bleed it whereas I usually do not have to do this unless I am priming the pump. This does not change the pressure gauge before or after, but I figured I would mention it just in case it helps.
    22,600 gal. Vinyl Inground
    FNS Plus 60 DE Filter
    WhisperFlo 1HP Pump
    MiniMax NT Heater
    Mineral Springs MS-10 System

  8. #8
    Senior Member Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    7,193

    Re: Filter Pressure Drop

    Quote Originally Posted by SPKNout4CHRIST
    Okay, tapping on the gauge did not change anything.

    There are some small bubbles coming out the returns by the steps. These are not like the bubbles that come out the return due to the SWG, but more like small air bubbles.

    I have also noticed that the filter is building up air and I need to bleed it whereas I usually do not have to do this unless I am priming the pump. This does not change the pressure gauge before or after, but I figured I would mention it just in case it helps.
    Could be you're sucking air somewhere. Less water flow means lower pressure. Start at the obvious. Check the gasket on the strainer. Be sure there's no cracks, no dirt or grass stuck to it, and grease it up good. Also check the drain plugs on the pump and strainer.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  9. #9
    Senior Member SPKNout4CHRIST's Avatar
    Join Date
    Mar 2011
    Location
    Goldsboro, NC
    Posts
    181

    Re: Filter Pressure Drop

    Took off the pump strainer basket lid and cleaned and greased the o-ring. Put it back on and viola! Pressure is back to normal and the bubbles that had been in the pump basket are gone. Simple fix and I am glad for it! Thanks for the help!!!

    God bless,
    Matthew
    22,600 gal. Vinyl Inground
    FNS Plus 60 DE Filter
    WhisperFlo 1HP Pump
    MiniMax NT Heater
    Mineral Springs MS-10 System

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •