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Thread: return pressure

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    return pressure

    opened my pool a little late this season i have a 16' x 32' in-ground started my filter up and return pressure starts out nice but almost stops to a trickle took the filter apart cleaned the inside dont see any leaks tank pressure holds at 28 lbs any ideas what could be causing my pressure to drop thanks for any help

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    Mod Squad Bama Rambler's Avatar
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    Re: return pressure

    Welcome to TFP.

    Which Filter do you have?
    What size pump do you have?

    Was the filter dirty when you took it apart?

    28 psi is really high for a clean pressure. Does the gauge go to zero when you shut the pump off?
    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

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    Re: return pressure

    I have a Hayward pro grid d.e. filter i have a Hayward 1 1/2 hp pump,yes the pressure goes to zero when i turn the pump off i did notice that when i turn the pump on the pressure is 22 lbs but as the return pressure drops the filter pressure goes up to 28 lbs if i turn the pump recalculate bypassing the filter the return pressure stays fine wirch makes me think i have a problem with the filter

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    Mod Squad Bama Rambler's Avatar
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    Re: return pressure

    How dirty was the filter when you cleaned it?

    The problem is not with your filter it's with your water. What does the water look like?
    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

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    Re: return pressure

    it was dirty and the water is green but the second time i cleaned it ,it wasnt as dirty but still having the same problem

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    GreatCanadian's Avatar
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    Re: return pressure

    I think you just answered your own question. Your water is green. Let the folks on here talk you through the shock process. I don't think there's anything wrong with your filter. It's doing it's job, and that's why the pressure increase.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    Mod Squad Bama Rambler's Avatar
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    Re: return pressure

    GC is correct. Your water is your problem. The filter is doing its job.
    Can you post a set of test results? And how you got them?

    The bottom line is that you need to perform the shock process until you pass the OCLT and have clear water. The pool school article on how to shock your pool is a good place to start.
    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

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    Re: return pressure

    i think your misunderstanding the return pressure drops in less then 5 minutes while the filter pressure goes up

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    Mod Squad Bama Rambler's Avatar
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    Re: return pressure

    That's exactly what happens when you're clearing an algae outbreak with a DE filter, it clogs really fast. Once you get it all killed, it will run longer and longer between cleanings.
    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

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    GreatCanadian's Avatar
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    Re: return pressure

    Trust these guys. They know their stuff. If you are willing to listen they will get you through this the best way possible. Your symptoms point to dirty water clogging your filter.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    Re: return pressure

    When I began the shock process, my cartridge filter required cleaning every hour for a couple of days. Now, I'm going about a week between cleanings. It can be done, just hang in there!
    Jorge - Tampa Bay

    • Pool Configuration
      11,000 gallon Stonescapes Mini Carribean Blue
      MX8 Barracuda
      Hayward C1200 Cartridge Filter with a DISABLED 3" In-line Chlorinator
      3/4 hp Jacuzzi Pump
      TFT 100 Testing Kit w/ Speedstir
      Wall Whale Brush / Aqua Comb Filter Cleaner

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