Preferably {HEAD ~ at least four woven nylon screens} are employed as {TAIL ~ the filter elements} in 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 as
Preferably { HEAD ~ at least four woven nylon screens } are employed as { TAIL ~ the filter elements } in 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 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 OTH OTH OTH OTH