All the big companies do large static systems. With the big Hydronautics RO membranes (Like the one here on a pure2o system):
they will fill a 1000ltr tank in a few hours. (the ones that usually come with Van systems)
If you have a DI only system, 1000 ltrs can be produced in around 25 minutes. More expensive to run though, depending on your local water hardness.
The Ionic systems brochure has a picture of a static facility with 4 x 1000 ltr tanks connected together and 2 large RO membranes and 2 DI cells.
So, yes it is possible, though I would imagine its quite expensive.
Thats nearly 3 litres per min running none stop. Alot of water.
Justin's right there, thats a rather high flow rate. Is that 2 people using the same system at the same time?
Normally 1.5 litres per min is more than enough.
-Philip