The "spray wands" are susposed to be good, but I have to admit that I am lazy and like the built in ones that are on our unit. I have heard of some that use rid-x for home septic tanks and place a little in their tanks with 5 gallons or so of water for the trip home. The "sloshing action breaks up solids along with the rid-x. Either dump when you get home or the next time you go out. All of the solids should be decomposed by then. I have never had a problem but I make certain that the tank is almost full before dumping, even if I have to add system water to the tank to fill it/
Keep the shiny side up.
WBCCI # 348
Past Region 3 President
Past President Tidewater Unit 111
Rick Bell in "Silverbell"