Originally Posted by type901
We have gutted our 21' 1969 AS, and we are planning its remodel. In reviewing other renovations, it appears that most people put thier black tanks right under the toilet. I would prefer to mount the tank in the rear road-side. Is there a problem with that? Would it be better to mount the black tank right under the toilet and then pipe it back to a dump valve next to the grey tank?
My rough drawing attached.
The main reason for having the black tank right under the toilet is being able to flush with very little water by dumping the solids straight down to the tank. If you locate the tank offset from the toilet, you'll either have to use a lot of water to flush, or you'll have to get a macerating toilet that will pump the waste to the tank.
If you get a black tank that mounts above the floor right under the toilet, that also gives you a steeper gradient from the tank to the slinky so that solids will dump more easily.