SIZE: 10” X 4.5” (254 mm x 113 mm) 20 Micron (20µ) Top Hole: 25 mm Bottom Hole 25 mm Use as a Stand alone Filter for Tank Water or as a Pre-Carbon Filter in a Twin Filter Unit. Reduce your Water Filter Costs in a Twin Filter Sediment Carbon Filter Combination Unit by cutting Sediment Load to the Carbon Filter. Pre-Filtering when using Tank Water Supply. Consider also using a Floating Suction in your Water Tank to reduce the Sediment Load on your Pleated Filter and extend its serviceable life. Sourcing the water from under the surface of your tank provides an overall cleaner supply than the conventional drawing of water from the anerobic zone in the base of the tank. Features: