I have just bought and new membranes and filters of Johns Hewett from Expand to Wash. Well with his advice and help I have tripled my ro out put.His a very knowledgeable guy that knows what he is talking about. AS a window cleaner with many years in the business knows were we are coming from.I bought a 100 psi 24 volt pump ,2x 100 gal membranes and 3 filters for 145 quit including vat and delivery I was impressed. I would recomend John to any windie having problems with RO and Di it is so easy to wast money on the wrong advice.