Hi ,I put a new 40/40 to in about 13months ago should it knackered all ready? When I replaced it from my old one I was surprised to see how fast it filled up compared to my old one which use to trickle in.i was told it was for low pressure so I presumed I got the right one. The tap water round my area comes out at 500 plus so could this be a factor why it doesn't last long? Also the water never went down to 000 or if it did it wouldn't last for long . Now the reading shoots up after a couple of weeks after I've changed the resin. Is there anything I can try or have just got to get a new to? Any help would be great thank you.