By Tom Nease and Paul Tedman

Two specialized equipment processes, the PDU® and SAS® , were developed by Extru-Tech, Inc. to specifically address problems encountered in aquatic feed manufacturing: the PDU, short for Product Densification Unit, and the SAS process, short for Sphere-Izer™ Agglomeration System, which was developed several years ago to improve both the quality and production efficiency of starter feeds.