Wife ask me to look at this many times, looked fine to me, but the last time I look at it up to light, sure enough slight film could be seeing, on screen. Reread MFG operation manual. It said to wash it every 6 mo months. It started to work after washing it in mild dish washing detergent. You could see a slight film on screen. After washing it several times with tooth brush it WORKED. So we sent for a new one just in case this one started to act up again, or if they stopped making this filter. Many thanks to AppliancePartsPros.com