Earlier this year I was parked about 50' from a dump and bought a FloJet unit. Connected it to a fairly standard 5/8" hose and pumped away. We have huge holding tanks so it took quite some time to do the dump as they recommend only running for 15 minutes non-stop. We used that every 2 weeks for about 2 months. We later that year we were in Vegas for a couple of months and did the same thing. We have never had an issue and have only cleaned any visible residue in the grinding chamber after disconnecting. Dumping the grey after the black leaves it pretty clean when the dump is complete.
