It is important to ensure the sprinklers are applying water evenly and efficiently to the landscape but it is much more important to ensure the sprinkler controller is only operating when necessary. Typical 3 day per week timer schedules waste between 40% to 60% (depending on the annual weather patterns) and thousands of dollars of water waste annually. No one would arbitrarily fill up their car 3 days a week when the tank is full, why water that way?