"First, you will get a build-up of goop and foreign objects in your sink drain. The PermaFLOW is made from clear plastic, not just because it makes for a nice show, but because it means you can see what and where the blockage is. Second, a built-in unblocker means you can clear the pipe with a simple twist of a knob — way easier than chemicals, bendy wire brushes or, worse, calling out the plumber."
via wired
