VinciaMaërl Crystalis a natural product, having a very low phosphate content. It is pre-eminently suitable for new ponds and to make turbid water clear and healthy. VinciaMaërl Crystalincreases the general hardness of pond water and activates the development of micro-organisms. Is is very easy to use. Sprinkle the granules straight into the pond. The Vincia natural products keep your pond free of algae and improve water quality naturally. They are 100% environmentally friendly and biodegradable. Vincia is for pond-lovers who prefer not to use artificial products but who do want to enjoy the life around clear water.