I'm a newby at this built in flush system and found it to be really easy and cleaned out the tank very well.
I drained the tank first,
Then connected the garden hose to my "Y", connected a second hose to the "Y":,
I had to use a Sewer Solution to reach my home cleanout, 1" hose,
Clear elbow on knife valve and then the SS,
Left valve open,
Ran water into the Tornado Flusher,
Water started to clear, shut off hose and let it drain completely,
Checked tank by looking through the toilet,
Re-flushed tank,
Checked tank with a dip stick, found to be really empty,
Rinsed all SS parts, let sun dry,
Rinsed and sanitized hoses attached to "Y",
Sun dried everything and stored in appropriate bin.
With two Fantastic Vents fans running on high in exhaust mode and toilet valve open, little or no odor from tank. Added requisite five or so gallons of water. I'm now ready for the dump stations using only the 3" Stinky Slinky and flushing at home. We're still on water restrictions so I hope all is well with how much water I sent to the treatment plant. I posted earlier about how bad the odor was when we bought this rig, got several hints from you'all and now we're clean and fresh and no additives.