As someone who's mostly switched over to concentrates and vaporizers but still enjoys a good flower rip, I was looking for basically anything that'd filter out most of the junk in smoke. Ended up with one of those percolating ashcatchers (which also work great) but was also interesting in the carbon filter. Overall, pretty solid. Came prefilled with charcoal and I just refill it from a giant tub meant for aquariums. Noticeably cuts down on that bong water smell that generally lingers, at the cost of THC. Make no mistake, you're losing a bit of your material as it passes through, but frankly it's pretty negligible. Not really sure what I'd do to improve it. The glass plug is kinda chincy but has zero effect on the product. If anything, I wouldn't mind seeing a half sized version for smaller pieces, but I'm weird and own tiny glass.
Wow just wow. So smooth. Pipe stays clean so does the lungs. Make sure to run water through the carbon first before use for best results.