Black tank chemicals, Happy Campers, TST, Aqua Kem ???

I use the single pack laundry soap and use 3 of them I dump the soap out of each package. I mix them in hot water in the bathroom sink which goes to the black tank. The only thing I know its doing is lubricating the valve. As far as black tank smell goes I use a 3 inch hose and allow a trap in the hose and that stops the sewer gas from the campground to back up into my system.