Answer
Jun 01, 2016 - 01:58 PM
The black tank valve should always remain closed. You should add abut 20% water and the recommended amount of toilet chemical to the black before use. The water is what will help to keep the odor down as well as flush waste down the sewer hose. Also use plenty of water during each flush, unless you will be without hookups for an extended period of time and need to conserve. The grey tank can be left open if there will be heavy use and it would fill quickly, but if possible it should also be left closed and left to fill before dumping. This will help to keep soap scum from building up on the walls of the tank and causing odor.
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