So, I've used k9 web protection for a long time as a web filtering tool to help me kick this habit, with limited success. After a recent relapse I was fed up with it and went looking for new filtering tools, which is how I found this software called Pluckeye. If you haven't heard of it I definitely recommend checking it out. It works completely differently than any other filter I've heard of, and is designed to be used by self moderators (like I'm assuming most everyone on here is). It doesn't actually block any websites, but all pictures and videos from every website are blocked, unless you "allow" a website, and even then the pics and video don't show up until after a pre-determined time (6 hours, 12 hours etc.) It really does make it near impossible to relapse. Anyways, if k9 or other traditional filtering tools aren't working for you, give Pluckeye a try (I'm not being paid for this I swear lol)
