... rust 3)Filter precision:1,5,10,20,30micron 20" PP Sediment Filter Cartridges 1.Brief ... Filtration ratings:1, 5, 10, 20 and 50 micron(4)Resistance to bacteria growth(5)Working temperature ... 1/2"(3)Filtration:1, 5, 20, 50Micron(4)Flow rate:20L/Min(5)Pressure drop ... 1/21, 5, 20, 50400.3-0.520 4-1/21, 5, 20, 50600.3-0.5Note ... :the length is not the problem,we can do 30" 40" or more 4 ...