Water system back-flow contamination

Does anybody have a good picture of the proper installation of a discharge line for a water systems back-flow (cleaning cycle) to the waste line I can “borrow”?


Are you referring to a water softener system?

Treat it as any other potential cross contamination point.

Specify the need for an air gap.

Yes to both above, but i am looking for a picture I can add to my report of a proper installation, I already have on of the wrong way. I have one filed away, but don’t have time to locate it.

You know, a picture says a thousand words.

Here is one of a ‘field engineered’ installation and another of an air gap device that is designed for such an application. Both are courtesy of Brian Kelly if memory serves me correctly.


Excellent, thank you.