I don't generally use any at all, but a few did come with a Rossi pipe I was gifted recently and I've used a couple in it since. I've also forgotten to add a new filter or replace it with the adapter and smoked several bowls without thinking about it with not a lot of difference other than having a more open draw. They will collect moisture for sure, but I dry my tobacco pretty well, so it doesn't absorb too much at all. I just prefer the taste without the filter blocking my path to pure deliciousness.