We have a facility that will provide a gym, art classes, weight area, aerobics, etc. It its mostly health activities related facility. The facility will have around 80-100 visitors per day, some of them using the showers, however i noticed that in the water efficiency calculator, visitors are not included in the shower usage, except for FTEs which in our case are only 10 people. How can I adjust the usage so that it accurately demonstrates savings of new showers installed for the facility members?