I have a whole house Aquat water softner and filter system (new system that was put in last week). I believe the incoming line is connected to the filter, then the filter output line is connected to the water softner. The water softner output line is connected to the house.
I believe both the softner and the filter has drain lines that are plugged into the drain/sewage pipe.
Currently, the filter is working nonstop and I can hear tons of water being flushed down the sewage line. The plumber shut it off but will be back next week to fix it (he will need to contact the company cause he doesn't know what the problem is).
My question is…..is it possible for the sewage pipe to backwash into the filter system? Are there any engineering/plumber standards to prevent this? (do you think the system has this in place?)
Best Answer
This should not be a concern in a properly designed system, short of a flood. If you're feeling especially paranoid you could put an air gap in that drain line, but ...