I just ordered the fine poly pad to put in all of my Aquaclears and was wondering what others experiences with it are. I know the two of these use different ways to accomplish the same result, but I'm hoping to use this as a replacement for Purigen. I'm getting tired of cleaning the Purigen and I have a couple of AC 20's that I don't like the way the Purigen fits in there. The only thing I don't think the poly pad will do is remove the tanins, which Purigen did an incredible job (but fouled up in a week).