The Photo-Fenton process, i.e., the system Fe2+/H2O2/UV-Vis, was successfully applied to a mixture of ten commercially available pesticides that served as a model for a proposed recycling plant for pesticide bottles. Experiments with single pesticides revealed that although all of them were degradable, there were remarkable differences concerning the reaction rate. Sunlight driven pilot scale experiments with the complete mixture were conducted. For the pesticide mixture the initial pollutant concentration and the amount of iron was varied. The addition of oxalate and different modes of oxidant addition were tested in order to improve the process. Thereby the reaction rate was increased, while the final degree of TOC reduction was affected only slightly. All the experiments carried out were considerably faster than the previously published results of degradation tests that applied solar driven TiO2/UV and TiO2/Na2S2O8/UV photocatalysis.