Water gets surprisingly less coverage as a particulate trap than woven filter media, but it can work better for most use cases, afaiu. Air washers and indoor w

Water gets surprisingly less coverage as a particulate trap than woven filter media, but it can work better for most use cases, afaiu. Air washers and indoor water features clean air by electrical attraction on contact and then lose some water to evaporation, so you may also need a dehumidifier. They have a higher, more consistent particulate reduction than HEPA, and no lower bound particle size limit, and they don't lose efficiency from filters clogging through use. You can also add a small UV-C light as an antimicrobial, and they are very simple to build.