The 3DP press is a three belt machine that is configured with a gravity belt thickener feeding a two belt independent press section. This allows the gravity drainage of the slurry to be optimized independent of the operation of the press section, something that is not possible with a two belt machine.

The Gravity Belt Thickener (GBT) is a very simple machine to operate having only three rolls and one belt. Typically used to thicken sludges prior to belt presses or screw presses. The GBT can also used to thicken waste activated sludges prior to digestion.

The HO3X3 press is a three belt machine designed specifically for fibrous sludges as found in the pulp and paper industry.