DURAN Filter discs_ d = 70 mm， porosity 4

d = 70 mm， porosity 0 d = 70 mm， porosity 1 d = 70 mm， porosity 2 d = 70 mm， porosity 3 d = 70 mm， porosity 5 d = 80 mm， porosity 0 d = 80 mm， porosity 1 d = 80 mm， porosity 2 d = 80 mm， porosity 3 d = 80 mm， porosity 4 d = 80 mm， porosity 5 d = 90 mm， porosity 0 d = 90 mm， porosity 1 d = 90 mm， porosity 2 d = 90 mm， porosity 3 d = 90 mm， porosity 4 d = 90 mm， porosity 5