I don't know about magical enzymes. If anybody has ever dumped with a clear section in your dump hose, you can see what comes out. And if you have solids (paper or poop), it is most likely NOT all coming out. Flush all you want. Use dawn all you want. Or Borax. Or ice cubes. You still have piles of paper and other stuff sitting on the bottom of your tank. UNLESS, you have one heck of a slope on the floor of your tank. But, many tanks are long and narrow. Toilet drops at one end, and dump hole is at the other.
Happy camper breaks up paper and poop into very small pieces. Even if it is only in there a couple of days. Makes everything much easier to dump and flush. Especially if using a macerator pump, which I use on occasion when I have to dump at home.
Not only does Happy camper break solids up into smaller pieces, there is also no smell. Not even on 100 degree days. I don't know how it works. Don't care. It just works.