You can use any 100% untreated cotton. I use some compressed cotton make-up removal pads, that I pinched off the Wife. They are 100% cotton, untreated, unbleached. I re-wicked 3 Evods and a couple of mini vivi novas today, but I've used cotton on an aga t2 in the past. It's a bit harder with the aga, checking for hotspots obviously, but the flavour from cotton is immense. Well worth doing.