If you haven't run into a home with a sewer grinder pump yet you haven't had the full experience of this profession. The last two homes my Buyers were interested in both had grinder pumps. I have learned the function of the grinder pump is to chop the solid waste into smaller chunks and drive the waste up hill to the city sewer system. In my research, I found these pumps to: a)be a potential $ liablilty for my Buyer in plumbing repairs when maintained by the homeowner vice the city sewer department; b) when the electrical power goes out, so goes the electric pump until power is restored; c) the Seller not disclosing the fact that they even have the pump and the potential maintenance and repair costs; and d) that the pump can be maintained by the city for a very large initial fee (which in this case equals the purchase price of a new pump) and a nominal service charge by the city to the homeowner when repair issues arise after closing. Just when I thought I was out of the woods verifying city sewerage and NO septic tank (with all that research and doucmentation) ..the GRINDER PUMP reveals itself. Don't get your paties in a wad, just do the research and inform you Buyer of his/her options. The city water and sewer department can be your best friend in this situation. It certainly was in mne and ultimately the best $ option for my Buyers.