Originally Posted by mpierce
Ordered the RV Digest it. Thanks. It is hard to back flush thru the dump valve, when there is a 90 deg turn just after the tank, then 10 feet of pipe, then another 90 turn, then the outlet.
you can attach the drain hose, elevate it to just above what the black tank but below the toilet top and put water in it. that way u can see if it will go back into the tank. if it goes in, u know the outlet is not plugged and the tank will accept water. sometimes a little movement in the opposite direction will dislodge a plug.
i'm concerned that if the water is backed up to the commode, that u won't be able to get the rv digest to go into the tank.
another concern: does the rv digest produce gas? if so, u may want to leave the flush valve open on the commode to prevent pressure buildup.
if u pour a gal of water in the vent pipe, does it come up in the toilet or drain out the drain pipe.
if it comes up in the toilet u know ur free into the tank. at least there will be a place for the pressure to go. if it comes out the drain, u are clear thru the tank and drain.
i would really like to see u make sure u have a place for gas to go before u start dumping chemicals in there. read the label carefully on the digest. forcing the flush valve to stay open while the digest works at least gives u a known path to atmosphere.