Originally Posted by Nsopti
Whats the best way to flush the black tank. Valve open? Or keep it closed for a little and than open the valve.
close drain valve, spray for a while, shut off spray, open valve and let it flow out, repeat until you're satisfied with the cleanness,....BECAUSE,... if your in-the-tank spray nozzle is mounted like mine(most are), it is mounted on the drain side of your black tank just above the drain hole,.... if you are spraying while you have the drain valve open and letting the stuff flow out, .... the spray is spraying into/against the flow of the stuff trying to flow out the drain, and actually hindering that flow towards the drain hole,..... FR must mount them there because its convenient and easier, if they mounted the spray unit on the opposite side of the tank, that spray would actually help push the flow towards the drain hole, but they don't.....
if you can determine that your flush unit is mounted on the opposite side of the black tank from the drain side, then ignore what I just posted, but it probably isn't.......