Just as our bodies require water to dispose of waste products, abundant water is required for proper sanitation — water that for much of mankind is simply not available.
Nii nagu meie keha vajab vett, et kõrvaldada jääkaineid, on ka reovete ärajuhtimiseks vaja rohkesti vett – enamikul inimkonnast pole see aga lihtsalt kättesaadav.