Neotec XJ-2000 Reviews

I bought two Neotec XJ-2000 unlts a few years ago upon recommendation from a coworker.  I had been waking up each morning congested.  I overheard my coworkers discussing various ionic air purifiers one day, saying they really helped with nasal congestion, and allergies. One had bought a large whole house unit (another brand) for $500 and was saying it made the wall behind the unit black and the replacement filters needed to be changed often and were quite expensive.  Another said he bought a Neotec unit and liked it and it had a washable filter and no black wall.    Upon his recommendation,...