Hi i have 200 gpd ro system with di how long should it take to do a litre please
This one is a "how long is a piece of string" type question as there are so many variables. I reckon if you get 15 litres an hour without a pump then that's not too bad. You might easily get double that though depending on conditions.
The clue here is the name of the thing.."200 GPD RO System". Its capable of producing 200 gallons per day, 100 per 12 hours or 8.3 gallons per hour. Thats at maximum efficiency, and thats probably US gallons and not EU/UK ones.