What if our dishes are sometimes not very dirty, yet we still need them clean? Now we can add less than a full load and choose the rack in which we want it all washed with ZoneWash. By selecting the top sprinkler only the items in the top rack(s) are washed, while by selecting the bottom sprinkler only the items in the bottom rack are washed. If we still want to wash a partial load with both sprinklers selected, they operate alternately. This provides tangible energy and money savings.