Here's my limited input on them, and I am in no way an expert. Some of this was in a thread a while back, too, summarized here, for ease:
Pro:
1. No cleaning, just replace every 3-4 months, so they are easy.
2. Very low micron level filtration (1 micron)
3. Micropure's website and it's reps vaguely indicate that Micropure "eliminates the need for stain and scale" by helping to remove "minerals", but when I asked directly if the filter was removing calcium from my water, he said no. His opninion: not to worry about scale and just replace my heater element in a few years! N0 thanks....
Con:
1. Expensive ($30-40 each, replace every 3-4 months)
2. Disposable- this would seem to be a con to me, for the waste factor, but I wonder if all the chems. etc to clean a regular filter are just as bad.
3. While the company likes to say that "you dont need" clarifiers, Defender, etc, what this also means is that you CANNOT USE these. They destroy the filter. I managed to do this myself.
Due to my hard water, I feel more comfortable adding Defender weekly to prevent scale, so I went back to regular pleated filters. I use clarifier very rarely, but if I have people over with lotion on, or other odd water clarity issues, I like to know that I CAN.
Back when I was looking into Micropure, and speaking with the rep, he said that something new was going to come out to remove calcium and other stuff. I just checked out the website, and this might be what he was referring to:
http://www.micropure.ca/rescue.htmThat is my 2 cents!