SGF-W01, SGF-W01 Rx, and RPF-4396508 are the most compatible filters for the whirlpool 4396508. Using our whirlpool alternative filters, you can remove up to 85 contaminants from your drinking water. Our products are NSF/ANSI 42, 53, and 401-certified. We provide high-quality and reliable filters at an affordable price at Swift Green Filters. Visit our online store to buy whirlpool 4396508 replacement water filters.