Power Blue Water Line & Tile Cleaner is a new non-acid-based cleaner designed specifically to clean water line surfaces quickly, easily and cost effectively. Power Blue is safe to use and does not adversely affect pool and spa chemistry. It is designed to be sprayed directly on the area to be cleaned and it immediately goes to work breaking down the water line mark. It can be wiped away easily with a non-abrasive spa cleaning pad. Power Blue is safe and highly effective on tile, vinyl and fibreglass surfaces and also works well on spa and pool covers.