Installing Submersible Pump Check Valve Questions

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mjs, Dec 29, 2020.

  1. mjs

    mjs New Member

    Dec 29, 2020
    Washington State
    I was hoping to get some basic questions answered as I am getting ready to install my potable water cistern.

    I have a Norwesco 500 gallon model 43101 cistern that will be filled from my well. I have purchased a Franklin C1 10GPM submersible pump to then feed the water to my house and shop.

    The C1 does not have an integrated check valve, so I am going to install one near the output of the pump.

    My questions are:

    1. What is the best and most reliable material to use in this submerged application? I was thinking either stainless steel or PVC. Most of the rest of the plumbing in the pump house is all PVC.

    2. Does a check valve have to designate it is designed for submerged use or can I just get a check valve and it will function properly while submerged.

    The easiest and cheapest thing would just be to use PVC, but I am worried that the $5 PVC check valve is just not going to be a quality product.

    Seems to me using a 3" - 4" stainless steel nipple from the pump output into a stainless steel check valve and then transition to PVC would give me the most reliability. Just not sure if I can just buy any old ss check valve and have it work correctly in the cistern or if I need a special part designed to work underwater.

    For bonus points, and not so much directly plumbing related, but any advice would be appreciated. Is there any special disinfecting or preparatory work I should do to clean out the cistern before first use? Due to the challenges of 2020, this project is taking much longer than anticipated and the cistern has been sitting empty in my pump house for about a year.

    Again, thank you in advance for any and all pointers to help me make sure my cistern installation goes well.
  2. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    Brass or stainless would be the usual materials.

    You want a spring-loaded check valve.

    You might be able to adapt some of the info from

    You could sanitize your well as well as your cistern.
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  4. mjs

    mjs New Member

    Dec 29, 2020
    Washington State
    Thank you so much for your help. I appreciate the info and will use it wisely!

  5. Michael P Cline

    Michael P Cline New Member

    Dec 30, 2020
    The ones i have done in 500 gal tank outside the pump are brass with stainless guts. Done 3 like that and all have lasted over 10 yrs
  6. valveman

    valveman Cary Austin Staff Member

    Mar 15, 2006
    Pump Controls Technician
    Lubbock, Texas
    Those bottom suction submersible pumps don't last very long. You would be much better off with a regular water well submersible and a flow inducer shroud. Then adding a check valve a few inches above the pump is fine, just don't put another anywhere else. Those 1HP, 33GPM, Hallmark pumps work well in a cistern and only cost 140 bucks.
    shroud 3 pics.jpg

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