25ppi Mesh Foam/Filter Sponge: 1)Excellent filte function 2)Reusable,washable 3)Acid-resistant,alkalifast 4)Flexible 1.Company Introduction: ... )Advantage:Excellent filte function, reusable,washable, acid-resistant,alkalifast, Flexible,good tensile7)Use: filter dust, air, liquid, equipment filter etc. 25ppi Mesh Foam ...