Aqua Rinse Concentrate is a highly effective, 2 times concentrated, fresh-smelling fluid for the flush water tank of your cassette and portable toilet. It is septic tank safe, safe for both plastic and ceramic toilet bowls, and prevents limescale build-up in your flush water tank. Aqua Rinse Concentrate also keeps your toilet bowl shinier and ensures a more effective and smoother flush. It comes in a convenient small bottle, so you can take it with you wherever you go.