... main field is WATER FILTER ELEMENTS, all the products meet international specifications. KING BRIGHT CO. has producted water filter cartridges by ourselves ... , we have PP sediment filter, PP string wound filter, Pleated filter production line, carbon block ... .) : 26,28,30,38mmL (Length): Depends on Customer's requireMicron Rate: 0.5,1,5,10,25,50,75 ...