The AP431 Filter with Aqua-Pure Whole House Scale Inhibition Inline Water System by Pureup is a set of three water filters made from coconut fiber. This filter is designed to inhibit scale build-up in whole house water systems, ensuring clean and refreshing water for your home. With a compact size of 9.49x7.44x2.6 inches and a weight of 2.91 pounds, these filters are easy to install and provide effective water purification. The standard packaging includes three filters, making it a convenient and reliable solution for your water filtration needs.