The Drop N’ Lock system includes an extensive offering of concentrated formulas that are convenient, closed loop proportioning at the point-of-use. Through innovative packaging and formulation, Drop N’ Lock provides economic advantages not found in traditional ready-to-use products. Drop N’ Lock’s unique cartridge system requires no equipment. Just add water to the supplied bottle, insert the 10 ml. Drop N’ Lock and attach the sprayer. The concentrate releases into the water making 32 oz. of cleaner.