Over a year at our house, we haven't had many plumbing problems. My wife's fallen hair does make the bath tub fill with water when I take a shower. My bathroom sink also had collected quite a bit of sludge in the pipe. These little packs almost look like white sand but they work decently well but I wouldn't say they are that powerful. They seemed to "clean up" the sink and my tub is clear now so I'm happy at least.