Culligan P5-D Level 4 5 Micron Sediment Filtration 2 Pack Replacement Cartridges by CFS Culligan P5-D Level 4 5 Micron Sediment Filtration 2 Pack Replacement Cartridges by CFS 5-micron, nominal, filtration Extra-fine sediment filtration reduces extra-fine dirt, sand, salt, rust and scale particles Pure spun-polypropylene fiber construction For use with model #HF-150, HF-160, HF-360 and most standard size sediment filters