Calgon has a unique formulation with active ingredients being polycarboxylates which softens hard water, preventing limescale from forming in the first place. It is not a descaler, it is purely a preventative - which means that the sooner you introduce Calgon into your daily washing routine, the better!
Calgon tablets are individually wrapped to provide a convenient, no mess, measured dose. Each tablet contains an expressball which actively protects against limescale and dirt residue from the very first seconds of the wash. As a result, Calgon helps washing machines to keep working properly and stay clean for longer.