Product review (4 stars): Great filters, no complaints
High-quality filters that work perfectly for the Oskar or Oskar Big Humidifers. I have never seen any mold (from eye level), even when it was time to replace them. They work as described but the long-term cost of spending $35 every 2-3 months ($150-200 per year) is tough compared with other filtersbut you get what you pay for, and these filters work perfectly.