I use the stock filler material. It doesn't ever wear out, it cleans just in running water or alcohol (drinkable). I haven't found anything that works better and I've tried them all.
The Fluval water polishing pad is pretty close to the stock filler. I just bought some to give it a try. I also have begun using the blue plug mod and it is very good.. The best I have ever tried to date. I can vape a cart completely dry with this mod and every hit is great.
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