Just looked at the site and noticed this.
NOTE: For optimum performance, Purolite recommend a minimum resin bed depth of 3 times the vessel diameter, the tower should also be filled with only 50% of its capacity with resin to allow for expansion
IMPORTANT - IF THE VESSEL IS FILLED WITH RESIN TO GREATER THAN 50% OF ITS TOTAL CAPACITY, THE RESIN, AS IT REACHES EXHAUSTION WILL DESTROY THE DISTRIBUTION SYSTEM AND BLOW OUT OF THE TOP, YOU WILL THEN NEED A REPLACEMENT DISTRIBUTION SYSTEM. WE THEREFORE RECOMMEND WHEN FILLING YOUR OWN TOWER THAT YOU COMPLY WITH THE MAXIMUM RECOMMENDED VOLUME
Well I have not heard that before.
Roy