I think there's a thread somewhere regarding crystal pro resin some batches unable to achieve 0 TDS reading. Basically could be the new resin has "expired" even without it been used before. Try changing a new one to see if there's any improvement. I also facing the connector slight leaking problem thru the 3/4" yellow hose at the connector joint. Couldn't find the same garden hose connector that I bought last time. I only using crystal plus 1 stage. Might go to Madpetz to see if they hv. I think my tap faucet (screw in type) is 22mm in diameter.