1.EFFICIENT FILTRATION Our black coconut shell activated carbon filters effectively remove sand, rust, heavy metals and large sediment particles from the water. They greatly improve the taste of water, making it purer and more pleasant to drink. 2.Safe materials: filters have passed the authoritative NSF certification and are made with natural coconut shell activated carbon to ensure the of the filtration process and the quality of the filtered water. 3.Economy options: Each pair of black filters can filter up to 6,000 gallons of pure and great tasting water, which corresponds to you to buy 4,500 bottles of pure water. This provides a costeffective solution and helps you save in the long term. 4.Reliable outdoor companion: our water treatment filters ensure clean drinking water and are therefore the perfect companion for outdoor adventures. Enjoy the great outdoors without worrying about the quality of your drinking water.