I have never used this stuff before but I always assumed it was a polymer (flocculant). Coagulants will create "microflocs" but you generally need a polymer to form these "microflocs" into larger particles that can settle or be filtered out.
Is the Accu-Clear slippery when you rub it between your fingers?
Then I believe this stuff is a flocculant, probably just a high molecular weight anionic polymer, very dilute. This stuff costs nothing to produce in that quantity, man they are making a killing on it (I should be in a different business lol...).
I normally just let suspended particles settle out on their own. If for some reason I need to clear up the water faster I have a small hang on canister with a fine micron filter in it that I use, temporarily, to polish the water.
Hmm, as im doing my regular wc today. I wanted to add some Accu-clear but wasn't so sure. Gave the whole bottle a shake, open the cap and I could hear FIZZING!!!
Sniff it, smells like pepsi...
Threw it in the trash can, im gonna use micron filter to clear my tank
A great little mech filter is a HOT mag 250. Also throw some Purigen in your canister, my water in my 33 is just annoyingly clear after I began using it.