Gardner hydro-tuff. Where I'm at, there is a abundance of not just gravel, but good-sized rocks, some very large. But even the HT gets pretty chewed up, so I have to cut off line, and even change line often. Also have to go using long Kryston snag leaders(at least 3'), and tubing if I can get my line through 3-4ft of it. Even with that, have to often cut line off.