Sorry to disagree with some, but the Sewer Solutions has a macerator built in, it is just powered by water and not electricity. It is a brass nossel that emits a high pressure flow that breaks up the waste if there is any and then pushes it through the hose. We are fulltimers and us it all the time. We leave the gray tanks open and let the water gravity drain, We also use a product called unique, it is a enzyme liquid and after ine inatial use of 4 oz, you only use 2 oz, of the product. We also use Angel Soft TP 2 ply. When we dump there is no solids, and no TP to be seen. I flush my Black tank twice and it is clear. I have also hooked up a 3/4" 75' hose at the former house and it pumped uphill to a clean out for the sewer. No problems. For the money's worth it is the best.