I have an idea and wanted to get some feedback. I thought about installing a macerator to the black tank and have it recirculate back to the tank. I know that it is used for pumping out but my idea is to pump the yuk back so it will clean out the tank better. So before you dump you turn it on let it do its thing then dump it out, fill with water several times until it all clean again. I think the pump recirculating would clean out the tank better. Now this idea is for mainly full timers and it is an involved process but I believe it will work better than just dumping straight out. I would also install it with a way to bypass the macerator if it should fail.