An adjustable filter system for a dishwashing appliance is provided. More specifically, a filter system is provided whereby the relative amount of fluid filtered by two different filters can be selectively controlled during operation of the dishwashing appliance. Flow can be directed primarily to one filter or the other depending upon the size of the soil particles expected at certain times during the cleaning process. Selection can be e.g., based on the temperature of fluid used in the appliance or determined by a controller.