BADU®TEC High rate sand filter The BADU®TEC range of sand filters is manufactured by Speck Pumps and has all the features and quality that you as a customer require. The BADU®TEC range of sand filter has a seamless, one piece molded polyethylene tank. Fitted complete with our smooth operating top mounted multiport valve for easy selection of standard operating features. The BADU®TEC range of sand filters is strong, reliable and simple to operate. They feature non-corrosive high flow ABS internal components and an automatic internal air relief system. The BADU®TEC range of sand filters is fully factory tested and under normal operating conditions carry a 12 month ex-factory warranty on the tank, the Multiport valve and internal parts from date of purchase.