***As far as I know the ionizer types can be harmful to our FIDS. It may be related to ozone generation. Perhaps someone else can chime in. I thought I saw mention of it here on the forum, but not sure. That is why we stayed away from that type.
Honestly, we blow out the HEPA filters with an air compressor hose outside. I know it reduces the filtering effects, but significantly extends the life. We mainly purchased the filter because Arika has this extremely fine down that goes everywhere and needed something to keep it in check.