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Overflow Tank / Ejector Pump I am not sure what the correct name for the "overflow tank" is. Its purpose is to catch the excess sewage (in case of flooding) and pump it out. I understand that some of these have built-in alarm systems so that one knows that there is a blockage. Perhaps it is...

We are installing a toilet in our basement and the drain pipe has a very small incline to the outside city sewer. Hence as per city regulations, we need to install a backflow valve to prevent he flow back into the house in case of city sewer flooding. All of that makes sense to me. Now here...