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The possibilities for source control are varied and often specific to particular pollutants. The availability of alternative cleaning agents has enabled the use of phosphate-free industrial and domestic detergents, for example, significantly reducing phosphate levels received by wastewater treatment plants. A number of countries have either implemented legislation or established voluntary agreements with detergent manufacturers at the national level. Significant potential remains, however, for a greater use of phosphate-free detergents across many parts of Europe and the establishment of Europe-wide legislation in this respect would ensure that this potential is realised.