How often should I clean the dishwasher filters?

Cleaning frequency depends on your usage habits: 3 times a year if you rinse before loading, 4 times a year if you only scrape before loading, 6 times a year if you do not rinse or scrape, and 12 times a year if you have hard water. You should also clean the filter after washing loads with large amounts of food soils or heavy starch content like potatoes and pasta. (Page 35)