bought a new bag of tulsion resin a few weeks ago and my ro unit has 2 di`s on it. but after 3 weeks work and only 1000L passed through it there both showing up 023ppm. so i went to the shed and got my resin and refilled the di`s. just checked and its coming out at 014ppm. WTF. its spose to be 000 so why is new resin coming out at 014ppm. HELP PLEASE.. everythings been done right.