1-year supply (four uses per bottle) Concentrated solution formulated especially for espresso makers uses only 4oz (125ml) per descaling cycle Extends life of your machine and improves quality of espresso by effectively removing mineral deposits (especially important for maintaining high-pressure components in espresso makers) Compatible with all types of espresso machines including for Breville, De'longhi, Braun, Rancilio, Diletta, Lelit, Gaggia, Cuisinart, and more Also compatible with all types of manual coffee makers, automatic drip, and most types of other coffee makers Liquid descaler for espresso machines. Improves operation and life of machine with regular use (recommended one descaling operation every 90 days) and improves quality of brews by keeping flow rates consistent. Concentrated solution requires only 1/4 bottle per use, so one bottle is one year's supply of the best care you can provide for your investment in home espresso. Also works wonders on most other types of coffee makers (check manufacturer's instructions for pod brewers and for use on aluminum moka pots).