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Thread: Bottom drain low pressure expected when fed into skimmer?

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    Join Date
    Jul 2016
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    Overland Park, KS
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    4

    Bottom drain low pressure expected when fed into skimmer?

    Is lower pressure from the bottom drain expected if it feeds into the skimmer? I took off the cover, and couldn't feel much pressure when pressing my palm against the side-facing drain pipe. Maybe this is just enough to do the job without a safety risk, but wanted to confirm if I should look into a larger issue.

    I was told I could typically brush minor dirt towards the bottom skimmer, rather than getting the vacuum out, but it seems to just re-settle without getting sucked into the drain (for the most part).
    Pentair WhisperFlo 2spd; SD80 w/CF; Intellichlor generator
    21k rectangular in-ground; 2 Jets in opp. corners; bottom drain feeds into skimmer

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    Re: Bottom drain low pressure expected when fed into skimmer?

    Try reversing it and close skimmers and just have bottom drain open

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    Join Date
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    Overland Park, KS
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    Re: Bottom drain low pressure expected when fed into skimmer?

    Thanks for the response. I believe you're suggesting that that I close off the skimmer line at/near the pump, but I don't have multiple lines to the pump. The bottom drain feeds into the skimmer area, then the skimmer feeds into the pump.

    Please let me know if I'm miss-interpreting your suggestion.
    Pentair WhisperFlo 2spd; SD80 w/CF; Intellichlor generator
    21k rectangular in-ground; 2 Jets in opp. corners; bottom drain feeds into skimmer

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    TFP Guide


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    Feb 2015
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    Chandler AZ
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    744

    Re: Bottom drain low pressure expected when fed into skimmer?

    Do you have a skimmer diverter plate in the bottom of the skimmer?
    Something similar to this: Amazon.com: Hayward SP1070FV Float Valve Assembly: Patio, Lawn Garden
    I think they are manufacturer specific as to size. You should be able to determine the manufacturer by looking at the bottom of the skimmer cover.

    There is a small plate on the bottom of the diverter that regulates flow rates between the skimmer and the main drain. The more closed it is that more it pulls from the main drain.

    BTW - it's not at all safe to remove the main drain cover and put any body parts close to it with the pump running. You could become entrapped and drown.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Re: Bottom drain low pressure expected when fed into skimmer?

    If you don't have a diverter maybe you can temporarily block the top skimmers with a piece of plastic to see if the bottom drain intake increases. I have never seen a setup like that. My bottom drain runs to the pump where it meets the skimmer return. I than can control each with a valve. I keep the bottom drain just cracked open to give the skimmer more water intake.
    Good luck
    Tom

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    needsajet's Avatar
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    Jan 2016
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    Sydney, NSW, Australia
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    3,552

    Re: Bottom drain low pressure expected when fed into skimmer?

    The float assembly is made so that it will close if the pool water level goes below the skimmer intake. The pump will then draw water from the port on the skimmer box that is plumbed to your main drain. If you block the skimmer throat, I believe the skimmer will drain down and then suck air. The float assembly is made to seal so there's enough suction to pull the water through the main drain line. It's also adjustable as proavia mentioned, so that you can adjust the balance between skimming and main drain when the skimmer is operating normally.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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