The ornamental fountains have to be disinfected at least once a year if they produce aerosols (especially those that have high level jets to oxygenate the water). The re-circulation of same water favours the appearance of algae and slime which is the main nutrient for the bacteria. Disassembly of pieces, filters and nozzles are required for a correct sterilisation, which has to be performed by professionals such as those at Doya Biologica.