Check the listing for details. BioGuard SilkGuard Complete 3" Chlorinating Tabs (7.5lb). Condition: New. Listed at 88.99 USD. ioGuard SilkGuard Complete 3" Chlorine Tablets (7.5 lb)Swimming Pool Chlorine Tablet3" Chlorine TabletCreates Softer Swimming Pool Water84% Available Chlorine BioGuard SilkGuard Complete Multi-benefit 3" Chlorinating TabletsThe most complete sanitizer ever. Keeps your swimming pool water softer feeling using SilkGuard Technology. Long-lasting performance and greater algae prevention with algae-killing crystals!SilkGuard protects your swimming pool equipment for longer life. It coats metal surfaces protecting them from corrosion and rust. It prevents scale formation in your pool circulation system and pool surfaces. Also contains SUNSHIELD which protects chlorine from sunlight, so you use less. Is Discontinued By Manufacturer No Brand BioGuard Item Weight 3.4 Kilograms Item Form Tablet Package Dimensions 10.3 x 6.6 x 6.6 inches Manufacturer BioGuard