A system for adjusting water in a domestic water diffuser, in particular for opening and closing water in a shower or bathroom or kitchen sink and for adjusting the flow rate, is described. The query is displayed to a user on a webpage. A second p-type clad layer made of a p-type nitride semiconductor containing aluminum and gallium is provided on the first p-type clad layer. The survey also prompts the employee to provide information including average hours worked per week, job position, etc.