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Thread: Plumbing Question

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    Join Date
    May 2010
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    Plumbing Question

    Hello to everyone and Happy belated New Years.
    I'm currently helping a friend with a 25,000 gallon in-ground pool, 3 returns,dedicated suction line,creepy crawler suction side cleaner. 3hp Pentair variable speed pump. The pump is one of the new types which local utility company offers a rebate. Whenever the valve is open to introduce flow from the cleaner line the pump basket begins to loose prime and will eventually become dry.

    My suggestion is to keep the majority of the pipe buried and place a Jandy 3way valve between the vac line and main drain line directly in front of the pump. Any suggestions would be greatly appreciated.

    Known issues:The main drain is clogged and the skimmer is missing the weir door. Pool is filled to middle of skimmer opening.


    Converted from pucks to BBB Pool store told him that the "forums" told one of their customers to put orange juice in their pool.. That's another topic......
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    10,000 gallons IG Freeform, 8ft raised spa,pebble finish
    FNS 60 Sqft DE Filter,2HP Whisperflow for Pool/Spa filtering
    2HP Whisperflow for Spa jets
    1HP Whisperflow for Waterfall
    Master Temp 400,000 Btu Heater

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    Re: Plumbing Question

    Whenever the valve is open to introduce flow from the cleaner line the pump basket begins to loose prime and will eventually become dry.
    If I am following you correctly, the only issue is there is an air leak in that dedicated suction line or, perhaps, at the valve that turns it on and off. Once you find that leak, the pump will hold prime.

    I am not sure why you want to alter the plumbing but perhaps I am missing something.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Orange County, CA
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    Re: Plumbing Question

    Your description sounded kind of similar to mine, in that whenever I switched the vacuum side to the cleaner line, I'd just get the pump basket filling with water. I thought it was a leak, but I've since cleaned out the line (by plumbing a special reverse flow circuit through the cleaner line) and now even if all of the suction is through the cleaner line, the pump basket remains free of air. I can't tell if you have another ball valve on the cleaner line so that shut down the cleaner line. The purpose of a 3-way valve is to simplify operation, but two ball valves can replicate the same functionality.

    As far as the skimmer weir goes, that should be an easy fix. Measure the width and height of the skimmer intake where the weir door should fit. You might also find that there are indentations near the bottom of the weir where the weir door has flexible tabs that hold the door in place. Once you have those measurements, you can pick up a new weir door from your local (or online) pool supplier. Then, just put the weir door into the weir space, holding the tabs in if needed, and it will snap into place. At least that's the way my Hayward skimmer works. YMMV.
    38K in ground pool with attached spa. Current equipment: Easytouch 8 (521150) with IC-60 SWCG with web control by Autelis, 1x Pentair IntelliFlo 011018 pump (for filter), 1x Pentair 2HP WhisperFlo pump (for waterfall), 2X Pentair IntelliBrite 5G 12V lights, Pentair MiniMax400 NG Heater, Pentair SMBW2060 DE filter. Zodiac Barracuda MX8 cleaner on dedicated cleaner line. Lighting/home automation controlled by Insteon/ISY-99i.

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    Re: Plumbing Question

    CraigMW brings up a good point that I overlooked. That dedicated suction line could have a blockage that might make it suck in air where it otherwise would not if the blockage was clear.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Plumbing Question

    IMO the vac line needs to be no taller than the intake on the pump, at a slower rpm the pump cannot pull water in and is "creating" air in the line.
    Over 30 years in the pool business
    We build vinyl, fiberglass, stainless steel pools
    Certified in Hydraulics

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