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Thread: Loss of pressure at filter

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    Loss of pressure at filter

    I notice recently that I have lost about 10psi at my filter. I've gone through everything that I can think of to resolve the issue, but I'm not sure where to look now.

    Yesterday I went out and backwashed the filter and I notice that when I put the multiport to backwash I gauge went up by 10psi, but then back down 10 psi after I returned the valve to filter.

    Do you think that the multiport is leaking or could it be something within the filter housing?

    Thanks for any help,

    Jim
    ____________________________________________________________ _____
    IG 25,000 gallon concrete painted pool,
    KDI American Products Model# 583090 Titan SS Vertical Grid 48sq ft DE filter

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    duraleigh's Avatar
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    Re: Loss of pressure at filter

    Pressure loss at the filter would be a restriction or blockage on the suction side of your system....that would also show up on the backwash psi......I am stumped.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Loss of pressure at filter

    I am getting a lot of water via the returns so some how it isn't developing pressure...is it possible that the water is going into the filter but not going through the panels, basically just running through the filter and not filtering?
    ____________________________________________________________ _____
    IG 25,000 gallon concrete painted pool,
    KDI American Products Model# 583090 Titan SS Vertical Grid 48sq ft DE filter

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    Charlie_R's Avatar
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    Re: Loss of pressure at filter

    A cracked manifold might cause the symptoms you describe. Might be worth opening it to take a look.
    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.

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    Mod Squad jblizzle's Avatar
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    Re: Loss of pressure at filter

    How old is the gauge? Does it go to 0 when the pump is off?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Loss of pressure at filter

    Quote Originally Posted by jblizzle View Post
    How old is the gauge? Does it go to 0 when the pump is off?
    I can't say how old the gauge is other than it has been there for more than 2 years.

    The gauge does go to zero when off, 10 psi when filtering, and 20 psi when backwashing. Normally the gauge is at around 20 psi when the filter is clean.
    ____________________________________________________________ _____
    IG 25,000 gallon concrete painted pool,
    KDI American Products Model# 583090 Titan SS Vertical Grid 48sq ft DE filter

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    frustratedpoolmom's Avatar
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    Re: Loss of pressure at filter

    You said you went through everything - have you opened it and inspected the grids? I agree with Charlie...
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Mod Squad jblizzle's Avatar
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    Re: Loss of pressure at filter

    It is rather odd to me that the pressure while backwashing is higher than when filtering. I have never see that be the case. Usually there is less resistance after the filter just out a pipe than there is when going all the way back to the pool and through eyeball returns.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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