This Replacement filter cartridge can be used in 135 square feet Waterway and Coast Spas (Canada). The respective product is manufactured in compliance with the technical specifications of OEM# 817-0147. These technical specifications make this replacement filter cartridge the best product to replace Filbur# FC-2976, Pleatco# PCST120 and Unicel# C-5351. The respective product is 5 5/16 inch wide, 30 1/8 long and has hole of 2 1/8 inch at both the ends.