Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Low pump pressure in filter mode only??

  1. Back To Top    #1

    Join Date
    Jul 2015

    Low pump pressure in filter mode only??

    Hello and thanks for letting me join!!

    While searching google for answers I found this forum ... so glad I did. My above ground has served the family well for 4 yrs trouble free. This year I'm experiencing my first problem. In the filter mode I have very little return flow ..I can almost stop the pressure coming thru the return line with my hand ... in recirculate I have very strong flow ... waste mode very strong.

    The only thing different this year is I took out the old sand, cleaned everything ... put in new sand. Perhaps I got something put back together inside the filter??

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Low pump pressure in filter mode only??

    Hello and welcome to TFP! I see you haven't received a reply yet on your post about poor curculation. I just wanted to let you know we haven't forgotten about you. This reply should get your posting updated back to the top of the queue where hopefully someone experienced with your specific question can provide some constructive answers. Thanks for checking-in with TFP, and have a great day.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Low pump pressure in filter mode only??


    What does the pressure gauge on the filter show. Not the return flow, the actual pressure in the tank.

    What you're describing is the classic symptom of a dirty filter. If the gauge is reading higher than normal, that will confirm the diagnosis. It could be that the new sand filters so much better than the old that all the fine debris that's been accumulating for years has clogged it up. A backwash will fix that. Or it could be that you have an algae bloom starting that you're just staying even with and the filter is clogging with dead algae. In that case, backwashing and the Shock Level And Maintain process will fix it.

    The other alternative is that you used the wrong kind of sand and it's packing too tight and stopping flow.

    Did this problem begin right after the new sand, or did it work good for a while and then start?

    So please answer the questions and if you could, post some test results and how you got them and tell us how the water looks.
    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!

Posting Permissions

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