HACB-Activated Carbon Filter Box ◆Using activated charcoal particles with a special chemical formula treatment ◆Reliable performance with high adsorption capacity and removal efficiency ◆Easy installation and maintenance ◆Frame can be made of galvanized steel sheet or stainless steel sheet See more at: http://www.hefilter.com/Chemical-Filters/HACB-Activated-Charcoal-Filter-Box.shtml