The PENTAIR RESIDENTIAL FILTRATION ECP20-BB Pleated Cellulose-Polyester filter is engineered for high efficiency in water filtration. This filter features a pleated design that increases surface area, allowing for superior dirt-holding capacity and longer service life. Constructed from a blend of cellulose and polyester, it effectively captures sediment and contaminants, ensuring cleaner water for your home. Compatible with Big Blue filter housings, this filter meets industry standards for quality and performance, making it an essential component for effective residential water treatment.