The ADS 30-Yard Dewatering Unit from AQUA-Zyme Disposal Systems can be filled with 22,000 to 25,000 gallons of septic, grease trap or municipal biosolids at 1 to 2 percent solids in two hours. After draining 24 hours, it can be picked up using a standard roll-off truck and transported for solids disposal. Sludge volume can be reduced by 80 percent, with reductions to 98 percent in BOD, COD, FOG and TSS. Effluent is clean, the unit has few moving parts, and the size of the filter media can be customized. Standard equipment includes a roll-over tarp system; side, floor and center screens; 1/4-inch floor plate; 7-gauge side plates; four door binder ratchets; eight drain ports; two inlet ports; and a long-handle scraper. The average life span is 12 to 14 years. Models are also available in a 15-yard size. 979/245-5656; www.aqua-zyme.com.