Eco comes packaged in "live Heterotrophic bacteria" and "Liquid Amazon buffered Black Water" flourite does not. If you do go with Flourite, here is a tip that someone passed along to me:
Build a rinsing screen in your backyard to get rid of the dust using a piece of window screen/shade materials (can pick some up and your local hardware store) and bricks of cement blocks. The idea is to build an elevated sieve of sorts. Stack the bricks up perhaps 1-2 feet off the ground, place the screen over the bricks and place more bricks on top of the screen. You need to make sure that you are making a sturdy stack of bricks and not building a jenga tower. I use cinder blocks.
Pour your bag of flourite on the screen and hose it out... Remove and repeat with next bag, etc. You should end up with much less dust in the mix than the traditional rinsing in a bucket.