Just received my filters today (Amazon told me they'd come today, but I thought it was some sort of error. Sunday delivery with free shipping!). Filters measure 10", and while I did not actually filter anything I verified they seal up tight in the Pentek housing. This was sold as slightly damaged overstock. The outer cardboard box was a bit pushed in on one corner, but I suspect the original problem was the outer shrink wrap. Each and every filter was individually shrink wrapped and in perfect shape, but they were loose inside the shipping box. I'm betting there used to be an outer wrapper that got damaged and removed, thus the price cut.
I am thrilled with them. Paid $45 for 50 with free shipping. 1 Micron, but I saw 5 micron there also. I bet with time more outer wrappers will get damaged, so anyone interested just check back every couple days.
Thanks again dralarms!
Pam in cinti