1. Wait until black water tank is full.
2. Take a long soapy shower and wash the dishes. Fills up the grey water tanks.
3. Flush black water tank. Close the valve.
4. Fill the john 4 times and let the water go crashing down into the tank.
5. Flush black tank again. Close the valve.
6. Flush grey water tanks, which cleans out the piping.
7. Fill the john and put in one of these.
8. Once fully dissolved flush the john.
Takes 15 minutes and I only have to do it maybe once every 10 days.