Unicel 6CH-941 Replacement Filter Cartridge for 45 Square Foot Stacked Top Load Waterway, Upper, Custom Molded Products

45 Square Foot stacked top load (upper) Waterway, Custom Molded Products. Note: Must be used with P/N 6CH-942. Replacement for: Custom Molded Products 25253 & 25254 (Note: 25253 (6CH-941) and 25254 (6CH-942) required (stacked).); Custom Molded Products 25253 & 25254 (Note: Two 25253 (6CH-941) and two 25254 (6CH-942) required.); Waterway Plastics 817-0011 (Note: 817-0011 (6CH-941) and 817-0012 (6CH-942) required (stacked).); Phoenix Spas (Note: Two 6CH-941 and two 6CH-942 required.); Sunbelt Spas (Note: 6CH-941 and 6CH-942 required (stacked).); Superior Spas (Note: 6CH-941 and 6CH-942 required (stacked).); Waterway Plastics 817-0011 (Note: Two 817-0011 (6CH-941) and two 817-0012 (6CH-942) required.); Sunbelt Spas (Note: Two 6CH-941 and two 6CH-942 required.); Unicel 45 Square Foot front access; Haven Spas (Note: Two 6CH-941 and two 6CH-942 required.)