postscript from Ken & Bob:
If you need to replace a portion of your inventory then reduce your regenerator bed level to minimum, reload with GOOD QUALITY Ecat to maximum bed level, circulate for 2-4 hours, repeat the steps (dump to min, reload with the good Ecat, circ for 2-4 hrs), then dump to minimum and reload with good Ecat to your normal operating level. Follow up with your fresh catalyst additions at a rate of about 1.5 times the normal usage for the next 3-4 days. This should help restore the inventory catalyst quality more quickly.
If you would like/need to have a discussion then let us know and we’ll set up a conference call.