Unicel C-8325 Replacement Filter Cartridge for 125 Square Foot Sundance Spas, Universal Length
125 Square Foot Sundance Spas - Universal Length. Note: Length recorded is measured to first step. Replacement for 18-inch to 18-1/2-inch overall length. Replacement for: Sundance Spas 6540-490 (Note: Length recorded is measured to first step. Replacement for 18-inch to 18-1/2-inch overall length.)