... Sewing 3.Plastic Ring or Steel Ring 4.Size, 7"x17" PP/PE needle Felt Filter Bags were made ... used in liquid purified with filter bag vesse together. 7"x17" PP/PE needle Felt Filter Bags1).Nominal micron ... 4 ) 6).High efficiency filter bag.(#1,#2,#3, ) 7).Activated carbon filter bag.(#1,#2,#3, ) 8).Pleated ... & PE: 0.5-200 μm NMO: 25-1200μmE: SG (All Sewing)WG (All Welding)F: A( Absolute)N (Normal ...