The deterioration of ground conditions can often lead to developers turning to vacuum sewage systems as a replacement for failed gravity systems. The vacuum systems offered by Redivac do not rely on gravity falls, with vacuum mains being laid parallel to the ground surface at nominal cover. Deep excavations are therefore not required and installation can occur with minimum disruption at a level above the unfavourable ground conditions.

Should it be required, Redivac systems can be fully integrated with existing gravity systems. Flows can gradually be diverted over a specified time period and the existing gravity manholes can even be adapted to house the Redivac equipment. Alternatively, flows can simply be intercepted upstream by the use of a new shallow valve chamber. Combining all theses attribute often makes the Redivac system ideal for the replacement or upgrading of conventional gravity systems.