I picked up a ro kemflo filter system used for 6 months for a $100.00 today. It should be a ro/di 5 or 6 stage. I was told it was 6 stage. It has one sediment filter, 2 carbon filters, a resin filter, a odor (taste,ordor,ect) filter, not sure what the other one is. I was told the resin filter is the di part. Good deal? I have know idea setting it up, help would be appreciated if you dealt with that brand.