A fritted disc is sintered glass particles forming a solid but porous body of glass in a disc shape. A glass fritted disc allows gas or liquid to pass through while filtering or trapping solid particles.
While this would appear to be amazing perc, and it is. We find it gets clogged WAY easy. So if you are a clean freak, this is great for you. If you let your pipe site, stay away.
See our percs here.