Combination tankers work within specialist projects such as the cleaning out and repairing of mainline sewers. Whether it is disused tank residue, accidental concrete blockage or a blocked drain, HCL will successfully resolve any scenario. As with all Hydro Cleansing vehicles combination units are fitted with a cycle alert system and highly advanced 360° CCTV systems with continuous recording to ensure safety is always maintained on-site and operational activities are transparent. Although combination units are not primarily tankers, they still have the capacity to hold up to 13,500 litres of liquid waste. They employ a multi-functioning system where they use both high pressure water and a high powered vacuum unit simultaneously. Through this method, they are effectively able to deal with blockages without it escalating into a flood, by both adding pressure and suction to the blockage. They are additionally capable of carrying out large scale cleaning projects whilst simultaneously vacuuming excess water and waste.