The advantage of fixed bed filters is obvious: entire "communities" of cleaning microorganisms develop from billions and billions of filter bacteria. With its curved, dense ClearWave blocks, the OASE ProfiClear Premium Standing Bed Module XL offers the perfect surface for the colonisation of the bacterial cleaning column, which effectively breaks down pollutants and nitrogen compounds. In the system, the module gives the pond water the finishing touch for absolute clarity. Up to 66,000 litres of water flow through the chamber every hour. An integrated bottom drain with slide valve makes filter flushing convenient. Made of high-quality, glass fibre-reinforced plastic (GRP duroplast), the filter housing is extremely UV and temperature resistant and therefore extremely durable. For the best result, an OASE ProfiClear Premium XL drum filter is installed upstream of the module.