09/10/2026
Within manholes, chambers and other wastewater assets, hydrogen sulphide (Hâ‚‚S) can be generated as part of the process.
In moist, oxygenated areas above the wastewater level, bacteria can convert Hâ‚‚S into sulphuric acid. Over time, this attacks cement-based materials, the result can be progressive surface loss and softening of the concrete, exposing the aggregate and, in more advanced cases, the reinforcement beneath.
TSM installs specialist Hâ‚‚S-resistant lining systems to protect wastewater structures against this type of chemical attack.
Applied to repaired or existing concrete, the lining creates a protective barrier between the substrate and the aggressive environment within the asset, helping prevent further deterioration and extend its service life.
With wastewater assets, understanding what is causing the deterioration is just as important as repairing the damage.