Forum Discussion
MarkTwain
Jan 16, 2020Explorer
Keep black and gray valves closed all the time until your black tank is 3/4 full. Empty your black tank 1st. then lack your gray tank. Close your black tank and fill it with the back tank from the shore line but use a seperate hose and use this hose only for the black flush. Add 15 gallons and then open the black tank again to flush out the black tank again. then close both the black and gray tank valves again. There is some black tank cleaning materials that help.
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