We love our Chemex. It must be said that it has perhaps the thickest filters
ever seen. They are very good at creating a clean brew. It is like the antithesis to the French Press. I would highly recommend trying these out. I would say that you should try different grind sizes. This would call for medium-fine grind. Not too fine so as to clog the flow of water, but not too coarse so as to under-extract. It is a tricky balance. If your flow is very slow, it could be too fine. This is the fun of the Chemex. More control over your brew time is what this thing will give you!