Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Stenner Pump Overflow

  1. Back To Top    #1

    Stenner Pump Overflow


    I had to order a new Stenner acid pump because my old one broke.

    The guy that put it in must've not known what he was doing.

    The pump is not leaking.

    But, the tank is leaking where you pour in water/acid. That is, water is flowing UP out of the tank.

    How and why is this happening?

    Any ideas on how to fix it?

  2. Back To Top    #2

    Join Date
    May 2007
    South Central NJ

    Re: Stenner Pump Overflow

    There should not be any water added unless you add it. Acid is heavier than water so a couple inches manually added (not absolutely required though) and keeping the tank covered and in a location that allows good ventilation will help keep any fumes down but the Stenner should be drawing from near the bottom of the tank. Your filter system should not be adding any water!

    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  3. Back To Top    #3
    Ohm_Boy's Avatar
    Join Date
    May 2007
    Orlando, FL

    Re: Stenner Pump Overflow

    If he installed the pump backwards, it would be pumping water INTO the acid tank and causing it to overflow.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

  4. Back To Top    #4

    Re: Stenner Pump Overflow

    Water is flowing back to the tank from the pool. Either the inlet/outlet lines are reversed or the roller head is bad.

    The suction line from the tank should be connected to the rear inlet, closest to the wall.

    If it is a bad roller head, they are easy to replace.

    You can use an injection check valve instead of the injection fitting in the future to prevent this if it is a bad roller. They do go bad over time, probably several years in a residential pool and they can make a mess by backfeeding pool water into the drums when they do.
    21' Leslies Beachland Ag Pool, 10,000 gallons, professionally installed (best money I ever spent) Hayward 16" sand filter w/Pentair two speed pump Fafco 4x20 solar heater,Aqua Trol RJ. Borates added. Hard plumbed.

  5. Back To Top    #5

    Re: Stenner Pump Overflow


    Check valve has got to be it!!

    I looked that up on stenner's website after everyone posted.

    When he replaced the pump, he never replaced the check valve.

    And I can't think of anything that would cause the pool water to run backwards into the tank as fast as this is running (it is constant when the pump is on and literally overflows the tank in seconds) except for that.

    I've ordered one already and I'll let you know in case anyone else ever has this problem.

    And I'll submit my Stenner pump model and details.

  6. Back To Top    #6

    Re: Stenner Pump Overflow

    Sorry, but the check valve isn't the total solution. If the roller head is bad the pump still won't be able to pump chemical. If the lines are reversed it still won't be able to pump chemicals...although with your further description it certainly sounds like more of a roller head issue to me.

    The check valve is just a second line of defense to prevent backflow when this happens. When the pump roller head is good it acts as it's own check valve because of the three roller design.
    21' Leslies Beachland Ag Pool, 10,000 gallons, professionally installed (best money I ever spent) Hayward 16" sand filter w/Pentair two speed pump Fafco 4x20 solar heater,Aqua Trol RJ. Borates added. Hard plumbed.

  7. Back To Top    #7
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Stenner Pump Overflow

    We had one of those roller pumps at the camp I used to work at. Ours was transparent, you could easily see which way the roller turned. I suspect the hoses are backwards. Or a roller is missing.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  8. Back To Top    #8
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Stenner Pump Overflow

    If it's overflowing when the pump is running and not when it's off, it has to be an incorrect installation. However, it's easy to swap the tubing. Just unscrew them and screw them on the opposite fittings. That should solve your problem.

    Since you've already ordered a new pump, keep it for future use or for adding acid in the future.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts