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Thread: Stenner not pumping bleach...

  1. Back To Top    #1

    Join Date
    Feb 2009
    College Station, Texas USA

    Stenner not pumping bleach...

    I have had this issue for a while now, and it baffles me. I've had the Stenner 100 psi 3 gpd pump for a little more than a year. Installed in May 2015. Worked well initially, but now I am convinced it's not injecting into my main line downstream of my filter. Here are some specifics:

    1) Pool filter operating pressure is about 20 - 23 psi. Stenner is a 100 psi pump.
    2) I have a new check valve in the injection head.
    3) When I simply run the discharge tube from the Stenner into a measuring cup, I get 8 oz of bleach in the cup in about 30 mins...the equivalent of 3 gpd.
    4) When I hook up the injection head and repeat step 3, i get a little less than 8 oz in the cup, but still, it's pumping fluid.
    5) My timer runs the Stenner pump about 3.5 hours per day, so about 0.5 gals of bleach per day.
    6) I made a DIY measuring stick for my 15 gal chemical tank. I can check it over several days and the fluid level does not go down, so when the injection head is connected to the pool, its not moving any fluid.

    So, the issue appears to be that the Stenner pump cannot buck the 20 - 23 psi pressure in the pool system. My injection head is installed using a T connection, and I did not trim anything off the injection head. So that little extension downstream of the main injection head body is intact and probably ends right in the middle of the flow stream from the pool system.

    Needless to say, I've got all kinds of issues with managing my FC level. Being a new Stenner pump owner (relatively), I'm not sure if this is an issue with the #1 pump tube inside the Stenner pump housing. I have never replaced it yet (but i do have spares), and I don't know if there is a connection between the lack of injection against 20 - 23 psi, and the mechanics of how the Stenner moves fluid through the pump tube.

    I found a thread that described a similar issue, but I think I have evidence that the Stenner is not moving any fluid, since my dip stick says that the fluid level stays the same in spite of the pump running and presumably injecting 0.5+ gals per day.

    Any ideas?
    Location: College Station, Texas
    9K gal in-ground plaster pool
    Hayward ProGrid D.E. 2420 Filter
    Hayward Northstar Series 1HP Pump/Motor
    Stenner 3 GPD bleach pump and Pentair 320 Inline Chlorinator

  2. Back To Top    #2

    Join Date
    May 2015
    Gaylesville, AL

    Re: Stenner not pumping bleach...

    IT sounds to me like you need to replace your tube... you have spares... use them.
    I am also a new Stenner owner, and in my research, I have found it to be prudent to replace the tubes every season.
    I DO tend to OVER research things at times... being a mechanic shop Foreman with new technology coming out all the time, so what do I know?
    14600 gal Intex 24' Round 52" deep AG Pool (Heavily Modified)
    200lb sand filter w/2 speed 1.5/0.5hp pump
    Stenner 45MHP10 Liquid Chlorine (well... bleach) Injector. Borates added.
    K-2006 test kit w/Speedstir

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