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2 filters. The Culligan D-40A Filter Cartridge in White is a set of two carbon block filter cartridges designed for under-sink filtration systems. The cartridges are compatible with the US-600A model and suitable for removing contaminants from water through carbon/charcoal filtration. Made of carbon block material and weighing 0.75 pounds each, these cartridges are an effective solution for improving the taste and quality of water used in sinks.