I normally buy 10 kg resin from a well know en supplier. I am having my doubts if it is virgin reason.I refilled my di and started to fill the water butt before I had filled it completely from a reading of nil it went up to 5 and I had not quite filled the butt.My tds at the time of filling the butts was 19 and remained at the same tds at the full time.I smell a rat this is tulsion or so it was sold to me as.