Originally Posted by GaryanJane
when using a full hook up rv site is it best to have the tanks open or closed until they need dumping ? have heard both but would like to hear from some full timers.
Leave the black and gray valves closed, wait till they are about two thirds full then dump the black and then the gray.
After flushing the black put a few gallons of water and a pack of treatment orange or blue or what ever it is that you use.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
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