Stenner pump delivering acid while pool pump is off

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AJB1234

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Dec 5, 2015
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Newport Beach, CA
Hi TFP,

Can anyone let me know what happens if a stenner pump delivers acid while the pool pump is off (no water flow)? One member said that the heater copper could corrode but I am using this in a fountain with no heater so could it affect anything else (the pool pump, the glass tile in the fountain, etc.)?

Thanks,

AJB
 
Thank you for your assistance. It hasn't happened yet but I want to be sure when I install the stenner pump that it won't be an issue. I'm not sure how to make it so that the stenner pump only runs when the pool pump is on. Since there is no pool there is no system other than the pool pump, filter, etc. Picture is attached as requested.

Thanks,

AJB
 

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You would install the stenner pump as the last item on the return line and place a check valve between the pump and your other equipment...this prevents backflow of acid into other parts that the acid would corrode.

As Jim stated, if the stenner pump can only discharge acid when pump is on, then I would suggest you calling the Stenner Manufacturer [or comp's that install it] and see what they require during an install...
 
1234,

I assume the pump in your pic is a VS pump and that it is used only to run the fountain. Is this true?

The simplest thing to do is just run the pump 24/7..

Another option would be to set up the pump with a schedule (Just as an example... 7 am until 7 pm..) Then use a mechanical time clock to control the Stenner and have it run inside the time the pump is scheduled...

The next option would be to buy a standalone SWCG flow switch and wire it to turn on a relay controlling the AC voltage going the Stenner motor.

I doubt a little extra acid one in a while would do any damage, but I would not want to set it up without some way to control when the acid was added.

Jim R.
 
Thank you all. The pump is a VS and it's on a schedule but for some unknown reason and on very rare occasions it doesn't start even when during the scheduled run time. I think the check valve makes the most sense for this application. I'm assuming that acid in the PVC pipe isn't a bad thing. Hopefully it doesnt make it's way to the glass tile part of the fountain as I don't think it would be good to have acid on tile without the fountain (pool) pump running.

Thanks again.
 
Hi, Would you please help me with the appropriate place to install the stenner pump injector into the plumbing (see pic). Also, could I just install the pump injector on the last downward section of the plumbing so that the acid would drip down and towards the fountain and not back into the pump (see added "white star" on pic for an example but again not sure if this is the appropriate pipe). Thanks!
 

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Where you tagged the Star, that is the suction side of the pump, you need to instal it after the filter/heater if you have one.
I also would not recommend injecting into the fountain better to a return.

Felipe
 
Thanks... the large brown cylinder in the pic is a hayward filter. I will install on that side, thank you. Can you explain what you mean by 'I also would not recommend injecting into the fountain better to a return.'? Wouldn't adding the stenner to the plumbing right after the filter inject this in to the return (still learning here so thank you).
 

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The injector is for the waterfall/fountain which doesn't have a pool. I want the waterfall/fountain to have a stenner pump so that the acid is automatically added (via timer) so the water remains more balanced. I am getting quickly getting a high Ph (over 8.1) due to the waterfall. Thanks for helping.
 
Can anyone tell me if I can install the acid injector on the vertical pipe (last pipe that goes into the ground before heading to the fountain) as a way to avoid installing a check valve (to prevent acid from going back to the pool/fountain pump)?

Thanks.
 
Yes, I am referring to avoiding installing a jandy check valve (not the one that is available with the stenner pump). Would it be ok to just install the stenner injector in the vertical pipe (last pipe that goes to the fountain) and avoid the check valve? This seems to make more sense than having more items added to the plumbing.

Also, can someone designate where on my picture I should install the injector? Would appreciate the extra confirmation that it's going in the right place. Thanks.

AJB
 
ajb,

What does the Jandy valve on the right of the filter control? Do you need chlorine in both of those lines? I assume this is the last valve before the water goes to your fountain????

Thanks,

Jim R.
 
One of the valves is to change between the waterfall and the jets (used to push water around a trough). The other is to change between normal operation and vacuum. I am only planning on using the stenner for acid (there is already an autochlorinator attached. Not sure which is the last valve before it goes to the fountain (that was my question, lol). I can always ask the pool builder. Thanks for all of your help,

AJB
 

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