Jandy TRUGUARDR TruGuard Replacement Cartridge is a sanitizing solution that utilizes the cleaning power of mineral technology to keep water crystal clear and free of harmful bacteria and algae while reducing chlorine usage. Used in conjunction with a chlorine or bromine delivery device, TruGuard is designed to be easily installed directly into the plumbing on the equipment pad and is constructed with the same durable material as our Never Lube® valves for long-lasting reliability.