The grinder pump station will be located outside, between the home and the low-pressure sewer piping.
The first line of defense against sewage backflow is the check valve (“backflow preventer” valve) on the discharge side of the grinder pump, which closes if flow is reversed in the line. The second line of defense is the pump station itself. In the rare event that the check valve(s) leak back sewage from the collection system, the pump station holding tank will fill and the pump will switch on automatically and remain pumping to push the sewage back into the collection piping. This will also set off an alarm to alert both homeowner and neighbors of a problem. If this happens, RS&W should be alerted and we will respond.