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Hagen, Pond Maintenance Made Easy. Murky water in your pond? Or do you have problems with algae or other plant pests? In this handy jacket-pocket book, youll find everything you need to know for interpreting the symptoms, determine the cause and remedy the problem, and enjoy a healthy pond once more: Combating algae using mechanical, biological and chemical means Important parameters and different methods for water analysis Filtering pond water Biological processes nutrient cycle, oxygen content, photosynthesis Physically, chemically and biologically effective substances for the pond pharmacy More detailed information is also available on the accompanying book website.