The Compact Batch Treatment Wastewater Treatment/Recycling System from HPI Processes, Inc. is a compact, quick and affordable solution for the treatment of smaller batches of wastewater. There are no systems better than the CBT System. With the ability to handle 30, 60 or 100 gallon batches, the CBT System offers the same top quality of treatment as all HPI machines in a condensed and mobile form.