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Thread: Pool pump no pressure but has flow

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    Pool pump no pressure but has flow

    Ok so I was out of town a couple of weeks. Got a lot of leaves in the pool on the bottom. So I was cleaning them out and noticed the pump sounded strange. Sounds like it's cavitating? I have water flowing and but the pressure is low. It's usually 20 psi and it's only like 3 psi. I have back flushed, replaced O ring on filter basket. I used snoop to leak check all over too but found nothing. I'm at a loss as to what it could be

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    Join Date
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    Re: Pool pump no pressure but has flow

    Quote Originally Posted by scum1 View Post
    ...............So I was cleaning them out and noticed the pump sounded strange. Sounds like it's cavitating? I have water flowing and but the pressure is low.
    How were you cleaning out the leaves? It sounds like you may have a dirty skimmer (do you have an equalizer port?) or a clog before you get to the pump (suction side)...... What does your pump basket look like?

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    Re: Pool pump no pressure but has flow

    Equalizer port? Skimmers are all empty. I was just scooping the leaves out with a net. The skimmer farthest from the pump has very little suction. The closer one has some suction but not much. I lined the bottom drain up and that did not help either

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    Re: Pool pump no pressure but has flow

    Here is a video of the pump

    20160112 1452211 - YouTube

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    Re: Pool pump no pressure but has flow

    You have air in your pump basket. It appears you have never fully primed or (more likely) are sucking air from somewhere.....

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    mas985's Avatar
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    Re: Pool pump no pressure but has flow

    That can also be caused by a clogged suction line or a clogged impeller.
    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

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    Re: Pool pump no pressure but has flow

    clogged impeller, if the pump basket has even the slightest crack it will allow debris to pass thru and clog the impeller, baskets can be flimsy on whisper flo pumps, the water movement when looking thru clear pump lid on your pump should be more powerful looking, compared to the weak appearance in video, and the mention of both skimmers also weak when isolated from each other, pretty much rules out skimmer lines being clogged, i have worked on hundreds of pumps over 25 years, (i am a pool repair tech, not a pool cleaner) it doesnt really matter how you clean your leafs from pool for the most part (unless you live in "leaf town") if your pump basket is frequently stuffed full of debris, it will over time split and crack, eventually clogging the impeller because debris passes thru it, so carefully inspect the pump basket, even if you dont see it cracked anywhere, get in the habit of inspecting it, and replacing it for even the smallest cracks, air leaks are most likely not a major problem for you as the pump appeared to be primed in video, when viewed thru pump lid, just had a very weak stagnant appearance regarding water flow/movement in basket area, very common condition with impeller blockage, compared to the normal more forceful water action seen when viewing thru pump lid under optimal conditions 20 psi etc.

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    Re: Pool pump no pressure but has flow

    The basket was cracked and I just replaced it yesterday. In fact I was going out to install the new basket when I discovered this problem. So how should I go about clearing the impeller? Just open up the pump? I've replaced the motor 2 times but it's been a while since I worked on any of this.

    Quote Originally Posted by pool&spatech View Post
    clogged impeller, if the pump basket has even the slightest crack it will allow debris to pass thru and clog the impeller, baskets can be flimsy on whisper flo pumps, the water movement when looking thru clear pump lid on your pump should be more powerful looking, compared to the weak appearance in video, and the mention of both skimmers also weak when isolated from each other, pretty much rules out skimmer lines being clogged, i have worked on hundreds of pumps over 25 years, (i am a pool repair tech, not a pool cleaner) it doesnt really matter how you clean your leafs from pool for the most part (unless you live in "leaf town") if your pump basket is frequently stuffed full of debris, it will over time split and crack, eventually clogging the impeller because debris passes thru it, so carefully inspect the pump basket, even if you dont see it cracked anywhere, get in the habit of inspecting it, and replacing it for even the smallest cracks, air leaks are most likely not a major problem for you as the pump appeared to be primed in video, when viewed thru pump lid, just had a very weak stagnant appearance regarding water flow/movement in basket area, very common condition with impeller blockage, compared to the normal more forceful water action seen when viewing thru pump lid under optimal conditions 20 psi etc.

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    Re: Pool pump no pressure but has flow

    When I bought my house, I had the same symptoms. I was able to clear the impeller with my fingers.

    1. Turn off power on the breaker

    2. Remove pump lid and the strainer basket.

    3. Push you fingers down into the impeller and feel for leaves/debris caught on the impeller.
    10,000 gallon in ground diamond brite, Circupool si30+, Hayward C900 cartridge, 1.5hp Flotec single speed pump

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    Cool Re: Pool pump no pressure but has flow

    Worked like a charm! Thanks. There was a bunch of leaves and a small twig even. I just bought a new basket for the pump as well as skimmer baskets. Guess I was a little late but I'm good now

    Quote Originally Posted by buzzard302 View Post
    When I bought my house, I had the same symptoms. I was able to clear the impeller with my fingers.

    1. Turn off power on the breaker

    2. Remove pump lid and the strainer basket.

    3. Push you fingers down into the impeller and feel for leaves/debris caught on the impeller.

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    Re: Pool pump no pressure but has flow

    When I bought my house, I had the same symptoms. I was able to clear the impeller with my fingers.

    1. Turn off power on the breaker

    2. Remove pump lid and the strainer basket.

    3. Push you fingers down into the impeller and feel for leaves/debris caught on the impeller.
    Incidentally, buzzard302, that was a great post......short, concise and easy to understand. TFP counts on those type posts to help our members. Thanks!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad tim5055's Avatar
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    Re: Pool pump no pressure but has flow

    Quote Originally Posted by buzzard302 View Post
    When I bought my house, I had the same symptoms. I was able to clear the impeller with my fingers.

    1. Turn off power on the breaker

    2. Remove pump lid and the strainer basket.

    3. Push you fingers down into the impeller and feel for leaves/debris caught on the impeller.
    Dave is correct, this is a great post.

    The key thing I like is the safety aspect - turn off the breaker!

    I will just add, IF the breaker is not within sight of the device you are working on you need to make sure someone doesn't turn it back on in error. In an industrial setting there are actually locks that can be put on a breaker, but in a residential setting just a piece of tape (I like blue painter tape) over the breaker will let my wife know I working on that circuit.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Pool pump no pressure but has flow

    TFP to the rescue once again! Thanks for this post!

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