Coming from the food we eat and the cleaning products we use, the wastewater from our homes and businesses is rich in the nutrient phosphate. This colourless chemical may not be seen in our waters, but it can spell disaster for our rivers and their wildlife. It acts as a plant nutrient, favouring nutrient-hungry algae and other invasive plants like bulrush, which then become dominant. This then affects the animals that live there. So water habitats that were once full of wildlife become polluted and dull, and very few plants or animals can live there. By being careful about the products that we use, and by managing our wastewater systems well, we can reduce the damaging impact that pollutants can have on our wildlife and countryside.