Once manufactured, the DRH4 is put through rigorous quality control testing prior to delivery. This includes functional verification and sealing of the tanks.
The DRH4 is equipped with a treatment tank for instant separation of high-volume liquids. The system responds to major oil leaks even during heavy rainfall.
As functional testing is to operate and check all electrical components and to detect any abnormality in the system, the treatment tank is exposed to the maximum flow of water and oil in order to ensure that all requirements are met. For example, the DRH4-V2 is rated to process 40 liters per minute.