If the water in your pool is starting to look slimly then this Algaecide is the best way to remove the build-up of algae. The build-up algae doesn't cause direct harm to yourself but it makes your swimming pool look unsightly & is the perfect ground for germs & bacteria to breed. Using this Algaecide is simple & easy, just pour the recommended dose into your swimming pool, ideally as close as possible to water inlets to ensure that it disperses evenly & to the best effects. All warnings & instructions must be adhered to, which are clearly labelled on the packaging.