Roltray Filter The IFC ROLTRAY filters are manual fabric filters designed for low flow rates, intermittent use or low budgets. Flow rates are 5 to 40 gallons per minute. Operation is simple, when the liquid level rises new fabric is pulled out across the filter. The ROLTRAY has a cutter blade for easy tearing of used filter fabric. Optional equipment such as pumps, coolant tanks and sludge boxes are available. All units are in stock. Click here for specifications.