Great info hags. Indeed, the membranes are getting worked in parallel.

It is important to remember that a 400gpd tfw membrane is only rated at 25% capacity at 32f. A 400gpd membrane should flow 100gpd of water, or .07gpm. 3 should give .21gpm. If you produce 12 gallons of water per hour that comes out to .2 gallons per minute which gives you 100% recovery.

Membrane fouling from sugar solutions has been found to be easily removed by frequent permeate rinses. It isn't ionic, and doesn't stick to the membranes very well.

The aquatec 8855 pairs well with 2 400gpd membranes (it lies somewhere between a 300 and 400gpd pump).

Carl