Yeah, you need to clean your pipes with a pipe cleaner after each use if they’re getting clogged. If you are doing that, and they’re still getting clogged, try inserting a pipe cleaner before you pack your bowl to ensure the draft hole doesn’t inadvertently get clogged. And lastly, it could just be the pipes you’ve bought. I personally haven’t experienced my pipes getting clogged or unusable and I pretty much use running the mill factory machine pipes.