{HEAD ~ The filter pad} 1, wherein {TAIL ~ the pad layers} having a substantially rectangular shape are connected to each other along three sides thereof to form a pocket therebetween 
wherein
{ HEAD ~ The filter pad } 1 , wherein { TAIL ~ the pad layers } having a substantially rectangular shape are connected to each other along three sides thereof to form a pocket therebetween
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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