Instead of purchasing the pondmaster 3-in-1 pond filter system, you can now purchase just the pond filter box to work with your existing pump. The pondmaster filter box includes a locking handle (top lid), carbon and polyester filtration media, and a side connection for tubing and fittings. Product Details: 12″ L x 12″W 2 filtration pads ¾” ID tubing & fittings How to assemble and use: . Filters ponds up to 600 gallons Provides mechanical & biological filtration Easy to install