The typical reverse osmosis de-salinator is generally operated for part of the day, perhaps 4 to 6 hours. In that 4 to 6 hours, the water used must be made by the R.O. System. Determine what the pure water can be used for and the daily amount required for: Washing Machine; Drinking; Showers; Ice; Boat Wash down (softened water and leaves no spots); Dish Washer. Divide the total gallon usage by the amount of hours the water-maker will be used. The resulting number is the Gallon Per Hour rating of the required water-maker. ie: 150 gallons used per day divided by 5 hours operation would require a 30 gallon per hour system, or a 720 gallon per day system.
Marine water-makers range from 7 to 263 gallons per hour of operation (170 to 6,300 gallons per day). Commercial water-makers range up to 50,000 gallons per day.
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