Quote:
Originally Posted by PaulandJan
Luckily when I turned on flush water I had both black and gray valves open or could have damaged the black tank.
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Just FYI, you wont damage the tank by having the valve closed while using the tank flush.
The reason the tank flusher warns to keep the valve open is because they are afraid people will get distracted, over fill the tank via the flusher, and end up with black water coming up through the toilet (or out the roof vent!).
I always close mine so that the flusher fills the tank some so I have an extra volume of water to help move waste out. I do this procedure a couple times typically.
When I do it though, I NEVER wander away or do other tasks and I keep a close eye on the panel to monitor the tank level.