i agree with what they claim, the truth is as you said it loses effeniency very soon. the Pureair becomes more eff. as the filter loads up by coagulation. if there is enough return in the house the Pureair has less pressure drop and maintains eff. longer than the CE.
the advantage the CE has over the PA is it has not maint. cost to where the PA has a maint. cost to change the guts. i am just making he point that the PA is a better filter due to removing all 3 contaminant in our air:
yeah, that is one of the things i do like in my area. we were trane dealers but it got to where anybody could put it in and they lost their name here. this is not to say anything about your quality of work i'm sure your a fine company but ou trane distributor was giving it to anybody who has a truck.