Product review (5 stars): Aluminum Pad with Silver Ion coating... Same as what is included with a New Humidifier Unit
I initially purchased the HC26P because it was the only part listed in my Humifier manual.  The HC26P is a cheap piece of paper that looks as though it will fall apart when wet ( the whole purpose of a humidifier pad )

After a long talk with Honeywell ( and two or three customer services agents ) I was finally told that the Part number of the original filter that comes NEW with the Humidifier is HC26E.  Apparently the "old" manual for the Humidifier listed several pad part numbers along with a description of these differences, but that is no longer the case.

This Aluminium Pad that is coated with silver ions is far superior to the paper pad.  The paper pad is a little cheaper but it needs to be replaced twice as often and does not have the same anti-microbial benefits... at less twice the price for something that is higher quality and lasts twice as long, this is the only Pad I will purchase in the future.