Unicel 5CH-402 40 Square Foot Filter Media 5.18 Inch Diameter Del Sol Spas Replacement Cartridge for 6540 and 723 Model Hot Tubs

40 Square Foot Del Sol Spas. Note: OEM original is 11-inch OAL and 5-1/2-inch OD. Replacement for: Del Sol Spas 6540-723 (Note: OEM original is 11-inch OAL and 5-1/2-inch OD.); Del Sol Spas 6540-723 (Note: OEM original is 11-inch OAL and 5-1/2-inch OD.); Sundance Spas 6540-723 (Note: OEM original is 11-inch OAL and 5-1/2-inch OD.); Sundance Spas 6540-723 (Note: OEM original is 11-inch OAL and 5-1/2-inch OD.); Jacuzzi Premium 6540-723 (Note: OEM original is 11-inch OAL and 5-1/2-inch OD.); Jacuzzi Premium 6540-723 (Note: OEM original is 11-inch OAL and 5-1/2-inch OD.); Unicel 40 Square Foot (Note: Replacement for Del Sol Spas.); South Pacific Spas