Biggest thing to remember about "chemicals" is the black tank is not a sewer system!!!
Yes, try and get as much liquid in the black tank before dumping. The gray tank is different..... it will be too full unless you have a hook up. As suggested, buy and use the clear elbow. It will tell you when you are done dumping, how clean the system is, and if you need to rinse the tank more or not. Doing the "Geo Method" is what I do.
Thats the one that you use a cup of Calgon and some detergent.
The biggest thing you want to do is keep the tank as clean as possible. The gray tank needs to be kept clean too, dont run bacon grease down the drain..... try to use the sink screen for food scraps.
On my camper I have a galley tank (kitchen sink) it is just as apt to start making a smell if not cared for properly........
As all the others have said, drain the black tank first, watch it with the clear elbow. Then drain the gray using it to flush the hose.
Then hook up the spray nozzle and clean the black tank. Again, watch the clear elbow to see if it is getting cleaner.
Some campers have a black tank rinsing system built in.... and you can buy one and have it installed.
(its a hose that goes all the way to the back of the tank and sprays the inside of the tank towards to drain)
Now you know just about all you really need to know to keep your black tank working.
jdadoug
