Refill cartridges are designed for the Just Add Water System, a safe, economical, ecological, efficient cleaner that only requires water. The portable JAWS cartridge automatically delivers the precise amount of concentrate. All you have to do is fill your work bottle with water, insert the JAWS cartridge, screw the trigger spray back on and clean. Bathroom Cleaner/Deodorizer dissolves and emulsifies lime, soap scum, oil, grease, mineral deposits. Fast-acting cleaner works on ceramic tile, grout, porcelain tile, showers doors, tubs, toilets and sinks. Small cartridges in a compact box dramatically reduce space.