Could anyone clear up what's up with these 3, comparison-wise? I've snooped around the net and all I've found is other people asking the same thing. I mixed a test batch of FX-15 and found that it was much more active than the Acutol data would indicate and I know that FX-15 is mentioned as Acutol-S. The Acutol data at Paterson and on Massive Dev Chart show different dilutions, etc than the FX-15 info seems to indicate. Does anyone have any experience with this?