The 100 GPD Portable Aquarium Reverse Osmosis systems listed below are designed for ease of use and convenience. If you require more GPD production capacity CLICK HERE to be taken to our under counter POU 200 GPD models. Say Hello to Tremendous Savings … The Average Delivered or Bottled Water = $0.81/gal — Aquasafe RO water = $0.02/gal. You save $ 0.79/gal. The average household consumes 3 gallons/day of drinking-cooking water or 1,095 gallon/year. You save over $850/year!