Cim-Tek 1 in. Diesel Pump Filter Kit - 30 Micron - 25 GPM - John M. Ellsworth Co. Inc.
Clear Choice Sediment Water Filter 30 Micron 10 x 4.50" Water Filter Cartridge Replacement 10 inch RO System 155101-43 R30-BB, WHKF-WHPLBB, 2-Pk - Walmart.com
SWC-45-2030 Hydronix Comparable String Wound Sediment Water Filter (30 micron) by Tier1