Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
Garbage Disposal Grinds Poorly, Leaks, or Is Noisy
If your disposal grinds poorly, make sure that you are running enough water while operating the disposal and that you are not grinding materials that you shouldn't.
If you notice leaks below the disposal, pinpoint the source of the leak, and tighten the offending connection. If necessary, replace the drain gasket or the unit's mounting screws.
If the unit is unreasonably noisy, check to be sure that something hasn't entered the unit that shouldn't have. If all is clear, you may need to replace the blade, impeller, or motor; this should be done by a professional.
Because these types of repairs can be costly, it's often cheaper, faster, and wiser to replace the entire unit.