Hi forum, Been trad for 6yrs then went wfp 5 month ago. Got all my kit from pure freedom. Spot on and so far so good! However, last week ppm went to 16 so stopped using it and ordered more resin..... Them realised ice never changed it before as I bought it full! So, emptied it all out. Cleaned it and refilled. Started filling but was coming out at 13ppm! Oh cr@p I thought. So opened it up and checked and it had sunk down to about half way. Realised I'd not shuck it down, so topped it up, and now purifying at 000ppm! Sweet! But, does this mean it was only getting to 13ppm as it want full? Can you just top resin up when the ppm starts going up? Do you always need to empty, clean, refill to 85/90% of vessel?