Product review (3 stars): Maintenance!
When I first bought these filters they were coated in blue and lasted almost 2 months before having an odor from mildew. That was short lived and they stopped coming in blue and now they last only 3 weeks maximum. Just recently the price has dropped from $15 to $9, so I guess that makes up for the longevity, but I wouldn't mind paying more for a filter which resists mildew longer.