Make seasonal cleaning of your BioFalls filter quick and easy with the BioFalls Filter Drain Kit. Simply insMake seasonal cleaning of your BioFalls filter quick and easy with the BioFalls Filter Drain Kit. Simply install using the second, un-used bulkhead in the back of the filter and run a drain line to a drainage area or garden bed. To clean, turn off the pump, then open the valve and return power to the pump to quickly remove the sediment from the bottom of the filter. This optional kit is compatible with the BioFalls 2500 or 6000.tall using the second, un-used bulkhead in the back of the filter and run a drain line to a drainage area or garden bed. To clean, turn off the pump, then open the valve and return power to the pump to quickly remove the sediment from the bottom of the filter. This optional kit is compatible with the BioFalls 2500 or 6000.