Product review (5 stars): Exactly the same as original
I bought this replacement pack at BBB. I wanted to address some of the bad reviews that I read here before I bought it:

(1) The granules in the replacement pack are exactly the same as the ones that came with my aero swiss humidifier (model 7135). I bought it about 2 years ago, so maybe aero changed the beads at some point? Anyhow, the new beads were exactly the same size and worked perfectly with my filter.

(2) I spilled some of the old granules getting them out, but getting the new granules in was easy and mess free. They provide a styrofoam plug which blocks the hole in the cartridge and a plastic cup that fits snugly over the top of the cartridge. You pour the granules into the cup then put the cup over the cartridge, invert it, and shake it gently until the granules are evenly distributed.

It all seems to work perfectly. I have no complaints.