Black tank

Heiny57, We use ours a lot. When dry camping or boondocking, we leave valves closed of course as we don't have a place to dump. sometimes grey water is salvaged and used to put out the evening fire. If the forest service you are in allows grey water to be dispersed on vegetation, take advantage of it and dump once every couple days. If we are in an RV park, with hook ups, we usually leave the grey water valve for the shower open as we are hooked up to the water supply and can take a longer shower. As far as the black water, we never leave that valve open, as said earlier you need to water volume to push all the solids out. Our normal practice is to start out with a little water in the tank, usually urine as we are conserving water. after the first day, I add about 1/2 the dosage of what is required for my 40 gallon black tank, this way the chemical is not down at the drain. After the second full day or into the third day, I add the remainder of the 40 gallon required dosage. We camp in cold, hot and comfortable climates and don't really encounter any foul odors. Make sure your vents are clear and odors should not be an issue. Trial and error for your specific situation is about all you can do. OH, when I get ready to dump black tank, I make sure I fill it up the rest of the way so the water volume is adequate to flush our solids. Good Luck & Be Safe ! ! !