I test things that interest me, and the water consumption of the Sewer Solution does interest me.
With the supply water at about 50 psi (no sewage discharge at all) and 10 feet of discharge hose, the Sewer Solution used just a little under 1 gpm of water. When the black water tank valve is open and sewage is also being discharged, the water usage should be a little less since the resistance in the discharge line will be a little greater.
My freshwater use with the Sewer Solution is no more than I use cleaning out the 3 inch slinky after dumping.
One advantage is the ease of extending the length of the discharge hose. It is simple to extend its reach by connecting 1" PVC pipe to the standard hose with the included adapters and simple PVC couplings. I have 20' of that pipe and have used it all at least once.
Another advantage is the small space required to store the discharge pipe. Just consider how much more space 40 feet of 3" slinky will require than 20' of 3/4" hose and 20' of 1" PVC pipe cut into 4' sections.
If you don't have enough discharge hose when you arrive at the camp site, you can correct that problem with just a visit to the local hardware store.
Good Luck!
Wil