I am new to de filters. I have just fixed a leak (hopefully), so note - air was being drawn. My concern is, as I've opened and closed this thing 5 times, I've noticed the fingers do not seem to be coated. There is just a pile of powder at the base of the filter. Is this normal? I had taken the filter head to a pool store in order to obtain parts (bump shaft kit, clips, etc) and the technician noted the fingers didn't seem coated and suggested adding more de. Just prior I had actually weighed out 5lbs required for the ec50. Any advice would be appreciated.