As some of you know, I bought a Pure Freedom van fitted system a year ago. Recently, I've started having a consistent problem with the DI Resin. It only seems to last 2 weeks! I've had this problem now for 4 months. It's costing me a fortune! I really can't afford to change the resin every two weeks. After 2 weeks, the water reading goes from between 0-2 all the way up to 12. Has anyone had this problem before? The RO produces 45 before it gets pushed through the DI Resin. I've tried asking the guys at Pure Freedom but they are stumped. Can anyone guide me?