Double Filtering Layers White layer Polymer HPEA Filter Paper Black Layer 250 Grids Full of Nano Mineral Crystal with High Efficiency Adsorption
Handcrafted and Lasting purification Every filter is Handcrafted. When smell odor or feel low ventilation, take out and clean HEPA filter paper, then expose Black Layer to Sunshine for 2 3 hours, to desorb and regain better ability of adsorption.