enblethen wrote:
The GEO method came around when laundry detergent had phosphates. I find that it does work as well with the new detergents.
Any comments or ideas?
I don't have any proof, but I suspect a cup of almost any liquid laundry detergent put into the black tank after a dump will do just as good along with some water. Let this splash around in the tank while you drive and it'll be pretty clean in short order. I do this before I start out, use the facilities until I need to dump the tank then proceed to use and dump the tank as normal for the rest of my camping trip. Seems to work pretty well, and if anyone really needs to know the type of detergent I use, it's liquid Tide (or whatever happens to be on sale).