Sweet Lu Cistern Blue - Industrial Strength automatic toilet bowl cleanser and sanitisier. It's specialised formulation is designed for the professional cleaning industry. It cleans, deodorises & sanitises the toilet bowl with every flush leaving a protective shield that repels stains. Flushes dipserse light blue foaming water and a refreshing sweet citrus fragrance. Simple and safe to install without the need of any alteration to the plumbing or toilet hardware. The dispenser stays in the toilet cistern away from children, vandals and the easily clogged toilet bowl. Premium formulation includes over 70% active cleaning surfactant so there is no need for extra chemicals or harsh brushes. (Lasts 3 months in the cistern)