The Hayward DEX3600DS Short Filter Element is a high-efficiency filtration component specifically designed for Diatomaceous Earth (DE) filter systems. This filter element, made of durable polyester, has a surface area of 36 square feet and an 18-inch diameter, maximizing its ability to absorb and hold tiny particles and trash. This filter element is utilized in pool and spa filtration... https://www.usapoolshop.com/dex3600ds-hayward-short-filter-element