PENTAIR/PENTEK Filter Cartridge: Pleated, 10 gpm, 50 micron, 9 3/4 in Overall Ht, 125°F Max Temp - 4BA87|155053-75 - Grainger
Pentek ECP50-10 10" Sediment Filter 50 micron 255484-43 Sale $8.67
AquaFlo 50 Micron 2.5"x 10" String Wound Sediment Filter / Part# 36102 - the water guys
Acid & Alkali Resistance PE Porous 10 50 Micron Sintered PE Filter Cartridge for Gas & Air Filter System - China PE Porous Filter Cartridge, PE Sintered Filter Cartridge | Made-in-China.com