This Filter Cartridge Set includes two premium top-load cartridges made to deliver excellent water filtration and clarity for a range of spa models. Each cartridge measures 14.5 cm in height and 20 cm in diameter, featuring a 4 cm coarse thread insert for secure installation. Designed to suit Signature, Aquazone, Cadillac (pre-2019), Bullfrog, and swim spas, these filters ensure efficient debris capture and improved water flow. Ideal for regular maintenance and reliable spa performance.