Ok, today i bought fluval water polishing pad for 304/305 and 404/405 fluval filters. The material is very soft and the employee said "its 100% poly-fiber and is not treated with any chemicals". It is almost identical if not identical to the stuff that comes in 510 carts. I got this tip from one of Ms. T's how to videos. First I rinsed it out and let dry. Then I cut a piece, stuffed it in, filled and vaped. It took about 9 drops but I did cut it shorter cause i didn't want to much filler in there. You could get about 15-20 drops if you completely stuff your cart. It vapes almost the same if not the same as a regular cart however, when the cart was dry i pulled the poly out which was dry but found liquid at the bottem of the cart. Is this normal? This only happened the first time i used it after that it seems to be working just fine. I also seem to taste less flavor but I have been using this juice for a while on the same atty so that may be why. I will say that the past week this juice's flavor seems to be tapering off. Also, Is poly-fiber and poly-fill the same thing?