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We bypassed the check valve by taking it out..keeping the flush line higher than the tank itself in its route to the tank and installed a simple gate valve for a Water hose where you hook the hose for the flush tank to work in the command center...since the flush valve sprayer enters the black tank in the sidewall iof the tank...a check valve prevents your wee wee water and etc from back flowing out the black tank flush line once your tank volume is higher than where the sprayer enters the tank in the sidewall of the tank...our troubles were the check valve and the sprayer tip itself...so we have redesigned the spray tip itself and now it works great...let's in about 5 gallons a minute....
We do not drain the black tank until it is basically full or every 3 or 4 days...gives it time to breakdown somewhat...then when we get home we refill the black tank with about 30 - 35 gallons of water and let it sit til we leave again...we are fortunate to have a dump hookup at the house....we also have a water meter we use to measure water volumes we put back into the black tank....
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