{HEAD ~ The washable filter materials} that may be used in {TAIL ~ the present invention} allows for reduced costs of operation and maintenance 
used in
{ HEAD ~ The washable filter materials } that may be used in { TAIL ~ the present invention } allows for reduced costs of operation and maintenance
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH