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All standard cartridge filters need a water filter housing to work correctly. At US Water Systems, we have the highest quality housings, made of components that meet all FDA and NSF standards. We offer œpoint-of-entry filter housings and Big Blue (BB) filter housings. US Water has the most complete line of Big Blue filters anywhere, and we can help you find the best solution for all your filtration needs. If you are not sure which filter is best for you, call one of our Certified Water Specialists at 1-800-608-8792.