For our two 25 gallon tanks I use 2/3 cup Calgon, 1/3 cup Dawn (I carry 9 pre-filled cup jars) and a scoop of Happy Camper mixed in a gallon of water and then a second gallon of water. Most goes in black tank, a little in grey. (We use a basin in the sink for washing dishes and then poor it into the toilet. Very little vegetable matter or grease goes into the grey tank.) Toilet paper gets bagged, not flushed. We have never had an odor problem.
I am thinking about not re-stocking Happy Camper when I run out, but this thread is making me reconsider that. Happy Camper is a little touchy to mix, a little messy to poor, and is prone to hardening if not mixed just right.
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