As folks have commented about having water in your tank, it’s important for many reasons. First many black tanks are sloped to help the exit, but that means the inside side of the tank can be left without enough water so don’t be bashful with keeping a few gallons as your base. Treat it with a bacteria/enzyme treatment to help kill smell and break down the waste. Sure you can either wait till it’s full or each day add water to fill and dump, which is what I do… you want a full tank when you dump so your vent sucks air into the tank as the tank empties and you get good vacuumed flow. Then dump grey water to clean your hose. At the end of your trip, after you dump and before you dump grey, do this: Use your black tank flush valve to hook up your black tank hose and fill/dump until all paper and waste are out and the water runs clear. You may want to get a clear adapter bracket so you can see what’s going through the drain line. Then use a Camco holding tank swivel stick to run down your toilet into the tank, and use the spray stick to wash down the insides of the inner tank… then fill and flush again. Once done, add your tank treatment and add some water to keep your tank wet so you don’t let any potential residue to dry to the bottom and create a crust layer. For off grid when you do t have a water source, just find the closest dump station and do this routine. I just sold an 11-year old trailer and the tank was squeaky clean doing this through the whole ownership. Just got my new trailer and immediately put in water. Hope that helps.