Yeabuddy - part of your post said:
"So my question is, has anyone ever really tested this? These products advertise "break down solids", "enzymes digest waste", "liquefies waste" etc. etc."
Were you refering to a specific chemical or additive or was it a general question?
I don't know if anyone has taken the time to do a real scientific study of the chemicals being able to break down solids because they would have to remain in the tank longer than the vast majority of people would go without emptying their tanks. Therefore there's probably not enough of a market for it.
If poop realy liquified in three days, no one should ever have a clogged black tank?
Bill