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Thread: High Pressure Low Output (with a twist)

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    High Pressure Low Output (with a twist)

    I have been reading the forums and see some similar issues but not quite what I am seeing.

    The Issue


    Turn on system (1 1/2 pump, sand filter, both Hayward) Pressure is at around 15/16, water flow is nice and strong. After about 30-40 minutes pressure starts creeping up and flow gets lower. 90 minutes later pressure over 20, flow almost not existent. Back washings seems to "reset" the cycle.. but same thing happens.

    First thing that came to my mind was a suction side air leak... but the the pump basket is completely full.. no bubbles or anything just clear water. I have reconnected all hoses.. nice and tight no leaks there ( i even lit some inssense to see of i could get some smoke to pull to the suction..nothing). When i attempt to vaccum the pool.. i lose all suction with in 5 - 10 minutes.

    I am hoping one of you have some suggestions as I am at wits end and the wife is saying to just put the winter cover back on and scratch the season as a loss.





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    borjis's Avatar
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    Re: High Pressure Low Output (with a twist)

    Have you ever deep cleaned your sand filter?

    It might be a ton of junk at the top...possibly. It would be worth taking off the top and checking at the very least.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  3. Back To Top    #3

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    Re: High Pressure Low Output (with a twist)

    Quote Originally Posted by borjis View Post
    Have you ever deep cleaned your sand filter?

    It might be a ton of junk at the top...possibly. It would be worth taking off the top and checking at the very least.
    Not only did I do a clean. I emptied, cleaned, new laterals, new sand.

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    GreatCanadian's Avatar
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    Re: High Pressure Low Output (with a twist)

    It sounds like it could possibly be the start of an algae bloom. 2 things make me think that. Firstly, you said you have little or no flow after 90 minutes. Secondly, you said that it seems to "reset" itself after a backwash. It sounds to me like the filter is doing its job, but there is lot for it to filter, hence the clogging. Barring an issue with the filter itself, an algae bloom is a strong possibllity. Can you test your chlorine level?

    GC
    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: High Pressure Low Output (with a twist)

    Quote Originally Posted by GreatCanadian View Post
    It sounds like it could possibly be the start of an algae bloom. 2 things make me think that. Firstly, you said you have little or no flow after 90 minutes. Secondly, you said that it seems to "reset" itself after a backwash. It sounds to me like the filter is doing its job, but there is lot for it to filter, hence the clogging. Barring an issue with the filter itself, an algae bloom is a strong possibllity. Can you test your chlorine level?

    GC
    Water is crystal clear and chlorine and PH within level.

    This is by far very very confusing.

  6. Back To Top    #6

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    Re: High Pressure Low Output (with a twist)

    When the pressure goes up and the flow drops, is the sight glass clear or dirty when you start to backwash? If it's clear, then the problem is not a clogged filter. Have you thought about bypass the filter - not pump to waste but return the water to the pool without it going through the filter? How old is the pump/motor? Is it hot to the touch when the pressure drops?

    Took out the part about the broken filter, didn't see your post about new laterals.
    27' Round Might Sun AG Pool 18000 Gallon Intex Krystal Clear SWG Hayward Pump/Filter on a Timer

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    Chasmengr's Avatar
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    Re: High Pressure Low Output (with a twist)

    I know nothing, but found this online (click on pic to see source):

    Capture.JPG
    Chas & Cheryl (first-time, second-year pool owners)
    Radiant Metric Oval AGP 16'x32'x52"; Pentair: Clean&Clear 150 Cartridge, OptiFlo 1.5 Hp 2-spd, and 320C Feeder (all mounted below water level); Taylor K-2006 & SpeedStir; Maytronics Dolphin E10 (aka Einstein)
    installation pics (2015-2016)

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    Re: High Pressure Low Output (with a twist)

    Quote Originally Posted by crokett View Post
    When the pressure goes up and the flow drops, is the sight glass clear or dirty when you start to backwash? If it's clear, then the problem is not a clogged filter. Have you thought about bypass the filter - not pump to waste but return the water to the pool without it going through the filter? How old is the pump/motor? Is it hot to the touch when the pressure drops?

    Took out the part about the broken filter, didn't see your post about new laterals.

    When filter is in bypass mode it runs like a champ for hours! Backwash is clear. The pump is warm.. not really hot.

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    Re: High Pressure Low Output (with a twist)

    If it runs ok in bypass mode, then it's got to be something in the filter causing the problem, somehow. Backwash is clear when it happens so the filter isn't getting too dirty. if the motor isn't getting hot, then it's probably not something like a failing motor. At this point I think I'd be taking the filter apart again. If the problem happens and you just turn the pump off w/o backwashing and wait, what happens? does the problem go away, or do you have to backwash to get the flow rate back up? Do you get sand coming out of the return when the problem happens?

    Questions I ask my customers

    Is this a new or existing setup?
    If existing, when did it stop working? What changed?
    27' Round Might Sun AG Pool 18000 Gallon Intex Krystal Clear SWG Hayward Pump/Filter on a Timer

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    GreatCanadian's Avatar
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    Re: High Pressure Low Output (with a twist)

    I find it hard to determine clear water from dirty water in my sight glass. Anytime I backwash the water in the sight glass looks clear to me. But I have a small sight glass, so that would make it hard to determine as well.

    I asked the OP for a FC measurement but only heard back that it was "in level". I'd like to know his FC level and CYA level, and how he got those measurements. I'm not ruling out algae yet! His pool can be visually clear, but still have algae starting. I may be totally wrong, but his filter behavior is precisely what would happen when filter is cleaning an above-normal load.

    GC
    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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