Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Pump/Filter Pressure Question

  1. Back To Top    #1

    Join Date
    Jul 2009
    Location
    Plainfield, IN 46168
    Posts
    22

    Pump/Filter Pressure Question

    FC 5.5 CC <.5 PH 7.5 TA 100 CYA 40

    Hi! We are on our first season with a pool that was built late last summer. Since we opened, we have ran the pump 24/7 with no problems. After studying this website, we decided to only run the pump about 12 hours per day. We have a hayward pump with 4 filters. We have tried several times to shut the pump off for several hours, but when we turn it back on, the pressure raises 6 - 8 psi and does not lower. If we do not shut the pump off, we can go up to 2 weeks without cleaning the filters and the pressure does not raise. Our pool is very clean (we vacuum weekly), so we cannot understand why the pressure increases each time we turn pump off. We would appreciate your help, since it would be nice to run the pump less and lower our utility bills.
    Thank you,
    Debbie
    10,000 gallon IG fiberglass pool.
    4 cartridge filter
    1 hp hayward pump

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,489

    Re: Pump/Filter Pressure Question

    I'm not sure I fully understand what is happening. If you shut down the pump and restart it later, the PSI raises 6-8 PSI. But when and how does it go back down 6-8 PSI? You said if you don't shut down the pump it is lower by 6-8 PSI but even then you had to start it at some point which meant it started out 6-8 PSI higher. So please give some more details on exactly what the PSI (absolute) is and when and under what conditions.

    It could just be a stuck gauge, try tapping on it.
    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

    Join Date
    Jul 2009
    Location
    Plainfield, IN 46168
    Posts
    22

    Re: Pump/Filter Pressure Question

    After cleaning the filters, it runs at approx. 8. It will hold at that for at least a week, sometimes 2, before going over 10 when we are running the pump all the time. If we shut the pump off, when we turn it back on it jumps up 6-8 psi, for a total of 14 - 16 psi. It does not go back down until we take it apart and clean the filters. The filters always appear to be clean when this happens. It does not appear to be stuck. If you have any other questions, let me know. I am new at this and have a hard time explaining the situation. Thanks for all your help!
    Debbie
    10,000 gallon IG fiberglass pool.
    4 cartridge filter
    1 hp hayward pump

  4. Back To Top    #4

    Join Date
    Jul 2009
    Location
    Plainfield, IN 46168
    Posts
    22

    Re: Pump/Filter Pressure Question

    Hi! Right now we are still running the pump 24/7, since we don't want to clean the filters everyday.
    We would really like to lower utility costs and conserve energy by shutting the pump off part of the time. If I haven't made our issue clear, please feel free to ask more questions. Our pump works perfectly (pressure at 8) except that the pressure goes up to 14 -16 every time we shut it off and turn it back on, unless we clean the filters, then the pressure stays at 8. We would really appreciate any input you have.
    Thank you so much for your help!
    Debbie
    10,000 gallon IG fiberglass pool.
    4 cartridge filter
    1 hp hayward pump

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,489

    Re: Pump/Filter Pressure Question

    A 4 cartridge filter should not get that dirty in such a short period of time. I have a 4 cartridge filter and a 20k gallon pool and I hardly get a 1 PSI rise after 6 months without a cleaning. What is the model # (size) of filter that you have?

    Something may be wrong with the filters but it is hard to say. Have you soaked them overnight in a cleaner (e.g. dishwasher soap) recently? If not, you might try that. Also, check to see if there is any hard scale on the filters. That would need to removed with an acid soak after the cleaning soak.

    Also, 24/7 should not be needed for your size pool. I have a 1 HP Hayward pump as well and am currently running it about 8 hours/day so you should only need about half that or 4 hours/day. I would go down to 6-8 hours and see if that keeps the pool clean.
    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

  6. Back To Top    #6
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Pump/Filter Pressure Question

    It sounds like something congealing on the filters when the flow stops. Have you added anything to the pool like floc, clarifier, etc.? I'm at a loss, I'm just grasping at straws.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  7. Back To Top    #7
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: Pump/Filter Pressure Question

    How is the flow from the returns before you shut it off and when you restart it at the higher pressure? Higher pressure with lower flow indicates clogging, but higher pressure with higher flow could indicate that a flow restriction or priming issue has resolved during the shut off time.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  8. Back To Top    #8

    Join Date
    Jul 2009
    Location
    Plainfield, IN 46168
    Posts
    22

    Re: Pump/Filter Pressure Question

    Hi! Right now, we have purchased new filters and are soaking the old ones in dishwasher detergent. We will let you all know how it does with the new filters. We will turn it off tonight and back on in the morning. We appreciate everyones interest and help so much. Hopefully the new filters and cleaning the old ones will take care of it. We have used floc for phosphates this year per instructions from the pool supply company, after testing our water at the beginning of the season. We realize now that we are on the BBB we should not need to worry about phosphates. We have rinsed the filters well, but have not soaked them at all. Hopefully, we will be good with the new filters. We will let you all know.
    Thanks so much for the help!
    Debbie
    10,000 gallon IG fiberglass pool.
    4 cartridge filter
    1 hp hayward pump

Posting Permissions

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