The 72 Sq Ft Sta-Rite® System 3 Replacement Filter Replacement Element is an essential part of the Sta-Rite® System 3 S7MD72 Modular Pool and Spa Diatomaceous Earth (D.E.) Filter. This 72 square-foot filter element is designed to provide high-quality filtration for your pool, capturing even the smallest particles and keeping your water crystal clear. Made from heavy-duty polyester with a reinforced core, the element ensures long-lasting durability and reliable performance throughout the pool season. It is easy to install and designed to optimize water flow, reducing stress on your pool pump and improving system efficiency.