The average North American uses 2 gallons of water per person per day for drinking and cooking. This means that the low waste membrane will send 2 gallons to drain per day - instead of a potential of 10 gallons to drain for a standard system. If one person uses their drinking water system every day of the year, this means that the low waste system will send 730 gallons to drain as opposed to 3650 with a standard membrane - a savings of 2920 gallons per year. The city of Toronto (for example) charges $0.01646815 per gallon. This means that by using the low waste membrane one person can potentially save $48.00 per year. The savings with more people in the home are more significant:
2 people - $98.00 per year
3 people - $144.00 per year
4 people - $192.00 per year