Preferably {HEAD ~ at least four woven nylon screens} are employed as the filter elements in {TAIL ~ a nylon housing}, the filter elements in the direction of flow successively having screen sizes of about 200 μ, 50 μ, 20 μ and 10 μ 
are employed in
Preferably { HEAD ~ at least four woven nylon screens } are employed as the filter elements in { TAIL ~ a nylon housing } , the filter elements in the direction of flow successively having screen sizes of about 200 μ , 50 μ , 20 μ and 10 μ
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH