Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
The Vyredox method for water purification was developed in Finland and is now also used in Sweden and some other countries. It oxidises the ferrous ion, which is soluble in water, to the ferric ion, which is insoluble, before the water enters the well.