Proper procedure for black tank rinse/sanitize

cchristanis wrote:
It was here p.18 under camping with grey valves open section:

http://manuals.heartlandowners.org/manuals/User%20Guides/Water%20Systems%20Guide%20V1.1.pdf

bid_time wrote:

cchristanis wrote:
I read to never leave both grey and black valves open at same time to prevent gas from going back in

wing_zealot wrote:
Don't know where you read such nonsense but think over what you read, some is credible, some not so much.

What it says is to not leave the valve open while camping. It doesn't say anything about having both valves open while dumping.