I've been a dripper of a year now but just discovered mesh and genesis (well not really discovered but tried them) and love them. I only have a really small amount of mesh and have no idea if it is good or not. I have a few fasttech meshes that came with random rdas and just bought 2 small pieces at a B&M of 400 but want to get more what is the difference between #300, #400 and #500? which one is the best? best place to get it? thanks!