According to some manufacturer's, ceramic cartridges (or discs) taps don't wear out but I've had to replace two cartridges in my kitchen tap in the last 2 to 3 years as the tap developed a drip both times.

From what I've read the ceramic valve get scratched causing the drip. Maybe my water supply is dirtier than most - Is it a good idea to put an inline filter in the pipe to catch any crap before it gets to the ceramic cartridge?