The Waterway 817-3501 R is a compatible replacement for the following pool filter cartridges:
The Waterway 817-3501 - Comp Pool and Spa Water Filter is a pleated pool filter constructed with 35 sq. ft. of media filtration fabric for cleaner water. This compatible Waterway pool filter measures 9 1/4 inches in length and 4 15/16 inches in diameter, and is manufactured with open top and bottom holes measuring 2 1/8 inches. This 35 square foot filter improves water clarity and reduces contaminants in swimming pools and spas.