AQuaBead 4.25: Size (4.25cu. ft.), Max Pond Size: 10,000 gallons, Flow Rate: 90 Gallons per Minute, Fish Load: 225 lbs, Dimensions: 24" x 35.5"--University tests show that one cubic foot of media have approximately 450 square feet of surface area! This volume of surface will cultivate enough beneficial bacteria to manage the waste from 50 lbs of fish feeding on a daily diet equivalent to 1% of their body weight @ 38% protein. * The AquaSwirl Internal Vortex is a unique circulation pattern that spins solids to the center of the filter where they collect and are easily purged through the AquaBead Sludge Drain Valve. * The AquaBead Bead Agitator is a dynamo powerhouse of air output! During backwash operation this 1.5 hp blower breaks up any beads that have packed together, allowing sludge to be flushed while beneficial bacteria is retained. * ALISS is the AquaBead Life Support System. In the event of pump failure or system shut an air hose from an external pond pump can be attached to a one way valve mounted on the front of the multiport valve. This enables you to keep precious bacteria alive indefinitely. GC Tek stands behind their products with one of the strongest warranties in the business. Every AquaBead filter is backed with a Limited LIFETIME Warranty! * Ships via Ground Package or Truck Freight. Liftgate Service is not Included. Made in the USA. Lifetime Warranty on Tanks and Multi-Port Valves, but not Rubber Parts. The Warranty Covers Manufacturer Defects Only.