300 customers from 18 countries participated at this round robin. It was executed by the Dutch KIWA institute at the end of 2007. They were from different sectors, as municipal sewage plants, research laboratories and several industrial companies. Analysed parameters were COD (high and low range), NH4-N, NO3-N, total N, ortho-PO4-P and total PO4-P. Once again, an independent institute has evaluated our products in a very positive way: 94% of all measurement outcomes were correct! We will offer a detailed practical report regarding this topic soon.