I am not OCD and on occasions use the built in tank flusher.
Full Timed for 7 yrs and NEVER had an issue or odors because the vapor barriers ('P' traps, seals/gaskets, vents etc. ) all worked.
And they are holding tanks which are going to get dirty again.
Dump when FULL (high liquid volume/weight carries boulders down/out)
Add some water back in after dumping so bottom of tank and anything left behind stays wet.
Get a clear dump adapter (attach on drain line then sewer hose to it) and you can quit wasting so much water flushing/rinsing your black tank 4-5 times using a ton of water :B

Built in flush system components:
Check valve inside hose connection on side of RV
Anti-siphon Vacuum Breaker
Spray nozzle (some rotate----some fixed)
