The HCF Series Filters feature an improved internal and external design that enhances performance and endurance. The filters distribute water more evenly with a multi-diffuser configuration, increasing filter cycles, effectiveness, and longevity of the filter. Installation and maintenance are easier than ever before. A transparent manway simplifies operation and the UV-protected and infusion molded fiberglass shell reduces corrosion and shields the unit from the elements, such as blooming and biofilm build up.