Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 14 of 14

Thread: filter pressure dropping?

  1. Back To Top    #1

    Join Date
    Mar 2015
    Location
    mobile al
    Posts
    16

    filter pressure dropping?

    Newbie pool owner here. Im slamming pool for the first time. Its very green. Ive ran the pump/filter for hours before and had no problem but now my pressure is dropping from 20 psi (where it usually is) to almost nothing. Ive wasted and backwashed and that helps for abt 15 min then back to around 5psi. Any ideas?
    35000 gal vinyl inground. Sand filter. Age unknown

  2. Back To Top    #2
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: filter pressure dropping?

    Welcome to TFP Phillip!

    Sorry to answer you with a question, but what is your starting pressure from clean?
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  3. Back To Top    #3
    Charlie_R's Avatar
    Join Date
    May 2013
    Location
    Mexico, MO
    Posts
    2,156

    Re: filter pressure dropping?

    Are there any bubbles in your pump basket? If there is, you've got a suction side leak.

    What else can you tell us about your pool equipment?
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

  4. Back To Top    #4

    Join Date
    Mar 2015
    Location
    mobile al
    Posts
    16

    Re: filter pressure dropping?

    My clean pressure is usually around 18psi. I know that the motor is a 1hp. The equimpment is old and wasnt maintained very well by the previous owner. Most of the stickers are gone from the equimpment. Sorry i dont have any more info. No bubbles in the skimmer basket but i do have bubbles coming from one of my jets. There is a hairline crack in the clear lid on the pump cap that is sucking a little air. Not much though
    35000 gal vinyl inground. Sand filter. Age unknown

  5. Back To Top    #5

    Join Date
    Mar 2015
    Location
    mobile al
    Posts
    16

    Re: filter pressure dropping?

    Could I have a clogged return pipe somewhere?
    35000 gal vinyl inground. Sand filter. Age unknown

  6. Back To Top    #6
    markmc's Avatar
    Join Date
    Jun 2013
    Location
    Sumter, SC
    Posts
    7

    Re: filter pressure dropping?

    I just found my pressure dropping during the slam process. Something I overlooked was the pump filter basket since I normally do this weekly during the season. It was clogged full of debris from the pollinating trees hindering the pump, hence the pressure drop. Cleaned it and back to normal. Might be something easy to check.
    13,593 ga. Celebration Disitnction LX 24' Round AG, Pentair SD40 Sand Filter, Pentair Dynamo 1.5 hp pump, Installed 7/8/14, TF-100 test kit

  7. Back To Top    #7
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: filter pressure dropping?

    Quote Originally Posted by phillipwyse View Post
    My clean pressure is usually around 18psi. I know that the motor is a 1hp. The equimpment is old and wasnt maintained very well by the previous owner. Most of the stickers are gone from the equimpment. Sorry i dont have any more info. No bubbles in the skimmer basket but i do have bubbles coming from one of my jets. There is a hairline crack in the clear lid on the pump cap that is sucking a little air. Not much though
    You need to replace it ASAP no matter how tiny. This is really important.

    Quote Originally Posted by phillipwyse View Post
    Could I have a clogged return pipe somewhere?
    A clogged return would give the opposite issue. As mark says above, check that too.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  8. Back To Top    #8

    Join Date
    Mar 2015
    Location
    mobile al
    Posts
    16

    Re: filter pressure dropping?

    Are you referring to the skimmer basket Mark? Im not sure of another one if you arent.
    35000 gal vinyl inground. Sand filter. Age unknown

  9. Back To Top    #9
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: filter pressure dropping?

    He means the pump filter basket inside the pump housing.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  10. Back To Top    #10
    markmc's Avatar
    Join Date
    Jun 2013
    Location
    Sumter, SC
    Posts
    7

    Re: filter pressure dropping?

    The one I'm referring to is under the clear plastic cap on your pump. It normally doesn't fill up as quickly as the skimmer basket, but if it is, that might be the issue, along with the crack you mentioned.
    13,593 ga. Celebration Disitnction LX 24' Round AG, Pentair SD40 Sand Filter, Pentair Dynamo 1.5 hp pump, Installed 7/8/14, TF-100 test kit

  11. Back To Top    #11

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: filter pressure dropping?

    As Patrick_B says, if you are sucking air, your system will not work. Replace that Pump Strainer lid. If you keep it dry, you can temporarily seal it with duct tape.

    Report back the results.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  12. Back To Top    #12

    Join Date
    Mar 2015
    Location
    mobile al
    Posts
    16

    Re: filter pressure dropping?

    Wow that did it guys. I didnt know there was a filter there. I feel like an idiot. Definetly not the first time ive felt that way. Thanks for the help!
    35000 gal vinyl inground. Sand filter. Age unknown

  13. Back To Top    #13
    markmc's Avatar
    Join Date
    Jun 2013
    Location
    Sumter, SC
    Posts
    7

    Re: filter pressure dropping?

    Glad we could help!
    13,593 ga. Celebration Disitnction LX 24' Round AG, Pentair SD40 Sand Filter, Pentair Dynamo 1.5 hp pump, Installed 7/8/14, TF-100 test kit

  14. Back To Top    #14
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: filter pressure dropping?

    Good deal, glad you got it sorted!!
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

Posting Permissions

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