The SilkGuard Complete 3” Chlorinating Tablets are a sanitizer that’s made up of a unique blend of compressed blue sanitizer and SilkGuard Technology that lasts longer than other white chlorines when the pump is turned off. SilkGuard technology is specific to the Bioguard brand. SilkGuard technology makes water soft and smooth all while preventing scaling and protecting against corrosion and metal staining. SilkGuard Complete 3” Chlorinating Tablets contain algae fight crystals that improve performance. This product can be used in all types of pools, pumps and applications.