Vincia Toru-Stroh is a biological algaecide composed of barley straw and bog peat. The combination of these two natural products provides a quick solution to troublesome algae problems in the pond. The action of the barley straw relies on the development of slipper worms and other plankton. These microscopic animals eat away the algae, keeping the pond clear and free of algae for a long time. The pH lowering effect of the bog peat enhances the effect. Toru-Stroh is 100% biodegradable and sufficient for 10,000 litres of pond water.