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Inside a Wetland filter - there are no moving parts, nothing can fail, no spare parts ever needed - it just filters like nothing else. These can be added to old Koi ponds etc with amazing results. - Landscaping and Water Features - Creative Cascades Inside a Wetland filter - there are no moving parts, nothing can fail, no spare parts ever needed - it just filters like nothing else. These can be added to old Koi ponds etc with amazing results.