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Construction of a Wetland filter, the best possible filter type which has no moving parts and is super simple. Unlike a factory built filter it just works and doesn't need constant maintenance or any new parts. The surface area for beneficial cleaning microbes is around 10 x that of a large factory made filter. - Landscaping and Water Features - Creative Cascades Construction of a Wetland filter, the best possible filter type which has no moving parts and is super simple. Unlike a factory built filter it just works and doesn't need constant maintenance or any new parts. The surface area for beneficial cleaning microbes is around 10 x that of a large factory made filter.