Gallons per day: APEC's smallest system makes 50 gal/day, but we don't need that much drinking water!Updated 3 months ago

Yes, we know nobody uses 50 or 90 gallons of drinking water a day. But you have to see this as the "speed" with which the RO system makes the drinking water. For example, a typical RO makes 15 GPD. This means it only produces about 0.6 gallons of water per hour at the standard pressure 60 psi and at the standard temperature 77 °F. So you need to wait at least 5-7 hours for a 3 gallon tank to fill! Not to mention, if your pressure is on the low side, and if it is winter time (average winter U.S. water temperature is only 35°F), then easily you can wait around for up to half a day (12 hours) just for the tank to be filled again! Now you see why a higher quality system needs to take speed into account. Let's take a look at our 50 GPD ESSENCE RO System: it is going to only take about 1.7–3 hours for it to fill your tank*. What a difference! Now you think 50 GPD is a good speed for a system, right! *actual result depends on your input water pressure and temperature.

Amount of water produced in 1 hour (at 50 psi & 77ºF)

*Tested in open atmospheric tanks at 50 psi input water pressure and 77ºF input water temperature.