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Thread: Low suction in skimmer

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    Join Date
    Apr 2017
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    Crystal Lake/IL
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    Low suction in skimmer

    I have 2 skimmers and a main drain. Each has separate plumbing to pool pump. I can isolate each skimmer and main drain. The issue I am having is 1 of the skimmers has low suction. If I close the other skimmer and main drain valves, the suction is now close to normal in that low suction skimmer. If I re-open the valves on the other skimmer and main drain the suction in the skimmer drops again.

    Filter pressure is good either way. Stay 25-30 psi. No air bubbles in pump basket or pool. Owned pool for 15 years, and have always had all 3 valves full open and worked great.

    any suggestions?



    35000 gallons...Sand filter,,,Hayward 1HP pump.. 2 skimmers, main drain each has its own valve.
    Last edited by flyguy112; 04-28-2017 at 08:48 PM. Reason: Identity

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    TFP Guide

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    Re: Low suction in skimmer

    welcome to the forum

    Does the skimmer that has the low flow have a diverter plate or float valve in it if so perhaps the cam inside is slightly closed or clogged. How are you determining low flow? If the water level is significantly higher than normal it can reduce skimming and make it appear as if the flow is lower than normal. How does the weir look? If they get cracked they can become waterlogged and ride lower in the water reducing skimming and again making it appear as if the flow is lower than normal.
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

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    Re: Low suction in skimmer

    I can tell there is low suction because I put my hand into drain pipe and I can feel the suction is low.
    35000 gallon in ground pool..Sand filter.. Stay Rite 1 HP pump. 2 skimmers 1 main drain.. each line has its own valve

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    Mod Squad Jimrahbe's Avatar
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    Re: Low suction in skimmer

    fly,

    Is the skimmer with the weak suction the one that is farthest away from your equipment pad?

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

  5. Back To Top    #5

    Join Date
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    Crystal Lake/IL
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    Re: Low suction in skimmer

    No it is actually the skimmer closest to the pump. The other skimmer and main drain have super suction.
    35000 gallon in ground pool..Sand filter.. Stay Rite 1 HP pump. 2 skimmers 1 main drain.. each line has its own valve

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    Mod Squad Jimrahbe's Avatar
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    Re: Low suction in skimmer

    Fly,

    Is this the skimmer that you use to vacuum? If so, it could have a pair of underwear as we just saw in another post...

    Or maybe leaves. If this skimmer has its own Jandy valve, then I would pull the valve apart and see what you can see. If nothing you could try running a wire tape (snake) from both directions.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

  7. Back To Top    #7

    Join Date
    Jun 2016
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    Boston, MA
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    Re: Low suction in skimmer

    Hi Fly,

    any conclusions? I have the exact same issue. The closer one gets little suction.
    Massachusetts
    Vinyl Salt Pool 2011; IC40 SWG; Raypark gas heater; Sta-Rite Dynapro pump; Sta-Rite System 3 Filter S7M120; Pool size: app 25000 Ga
    first time pool owner. First year too.

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