Makes up to 10l of softened water depending on water hardness can last up to 3 months removing calcium from your water and helping to prevent limescale easy to use simply remove the cap fill with tap water replace the cap shake and then pour softened water through the nozzle prolongs product life limescale build up can stop your steam product whether iron or steam cleaner from working using water softener helps to prevent limescale build up replacement indicator crystals turn from oran