Hi Gifted - the merlin is rated as a 720USgallon/day RO system, which is 720*3.78 = 2721.6ltrs per day.
Our water pressure is 45psi and inlet tds is between 300 and 350ppm, we get around 2000ltrs product per day.
Overall the merlin represents great value for money, is simple to maintain and doesn't need a booster pump under normal conditions, by the way our product water from the merlin is 4ppm.
Go on, get one, you'll be glad you did.