IPS: A primary topic of discussion at a weeklong international water conference here can best be summed up in two words: “dirty water”. Ironically, the venue for the vibrant debate – focusing mostly on pollutants, industrial waste and human sewage – is a city described as home for “world class water”. And rightly so, claims Gosta Lindh, managing director of the municipally-owned Stockholm Water Company. Unlike people in most other parts of the world, “We are blessed with an almost …