As an Amazon Associate, we earn from qualifying purchases. A.O. Smith AO-4000-CARBON RO Boost Carbon Block Filters A.O. Smith . AO-4000-CARBON Gallery Attributes Brand name, Manufacturer name, ManufacturerA.O. Smith Extra Product NameA.O. Smith AO-4000-CARBON RO Boost Carbon Block Filters keywordsA.O. Smith AO-4000-CARBON RO Boost Carbon Block Filter moq, multiple, tierMinQty11 MPN, SKUAO-4000-CARBON qtyInStock0 snippetThe effectiveness of reverse osmosis is undeniable, and products like the A.O. Smith AO-4000-CARBON are the reason why. Designed to help sift out various types of particulates, this product will have you on your way to healthier, better tasting water. Shop today! tierPrice174.95 Distributor offers SellerSKUMOQIn stockMultiplePrices filtersfast.comAO-4000-CARBON111 @ $74.95