How do I empty and clean the filter? Advisor Theresa February 21, 2019 20:41 Updated Check Filter Screen for residual product build up. When your filter is clean light will be able to be seen through the filter screen. *Pictures below exhibits dirty vs clean. Related articles What kind of maintenance is involved with RevAir? What hair products can, or can’t I use with RevAir? RevAir Quick Start Guide Own It, Love It Guarantee Specs of RevAir device Comments 0 comments Please sign in to leave a comment.