Close the black water tank valve. Add about 5 gallons of water and use. Be sure to use lots of water when flushing poo. When the holding tank is full, dump in the appropriate place using a standard sewer hose. If your in a full hookup situation, you can leave the gray water valve open. I generally keep it open, and close it the day before I plan to dump the black tank. I use the stored gray water to flush the solids down.
Toilet paper is your biggest concern in black storage tanks. Use only septic approved TP. Lots of water and never dump a partially full tank are the keys.
