Metabs provide a convenient way of adding measured quantities of sulphur dioxide. It’s easy to use tablet form means no need to measure or weigh.
Metabs prevents biological spoilage and microorganisms from growing and reproducing. It’s antioxidant properties increases the stability and prolongs shelf life to the beer.
Metabs can be used for the removal of free chlorine in tap water which can cause chlorophenolic off flavours in beer
You can also Use metabs to maintain freshness in casks, when stored empty.