A maximum strength, large yellow tablet used for initial cleaning and sanitizing of your vacuum system. Used every 2-3 months. VacuShock will break up and remove old aged buildup that over time, has allowed to produce deep in vacuum lines. Non-toxic, non-corrosive and non-foaming. Releases a concentrated, anti-microbial agent, removing biofilm, fluorides, amalgam, hard water deposits, and all cross-contamination leaving your vacuum-lines like new.