Ours came with a sani flush system and we use it. It takes several minutes to fill the tanks to the top sometimes because we empty them every time we pull up stakes and we clean the tanks. Sometimes if it is just overnight we don't.
It takes a few minutes but who cares. We stay t full hookups almost all the time.
I have encountered some with problems along the way.
Keeping tanks clean prevents problems and keeps sensors clean and working. I don't know how many black tank and some gray tank problems have been discussed here over the years but it is quite a number.
Those who just dump are the ones with prymids, stuck valves and odors in the coach eventually.
We use chemicals too whether sitting still or just pulled up and on the road.
Atone campground in NC Coach behind us hooked up to septic sorta meaning not good connection and opened and left open his black tank the smell was terrible.
Part of it was the septic system was storage and pump out setup and gases coming back out.
The other part was the coach's tanks. When they were getting ready to pull out they had problems. I don't know how long it took them. I offered to help but he didn't want it.
We cleaned tanks and left.
