... , brass shape: square ,round, ring ect Heteng Metal Filter Equipment (free sample)Metal Filters media filtersfor the filtration of air ... sales department,and also the top Management .As for Equipment,we have About 60 sets of machines. And we ... in foam, liquid and air, by way of distillating, absorbing, evaporating and filtering process, in petroleum, chemicals, metallurgy, machine, pharmaceuticals, ...