Acidophilic bacteria activity is a serious problem for asset owners when the right conditions exist in a sewer system, capable of corroding and destroying up to 25 mm of concrete per year. While acid resistant materials such as organic resin, polymer, plastic sheets or fiberglass inserts can withstand low pH, the acidophilic bacteria continue to breed and develop on these surfaces, making their way through any flaws. Polymer materials are hard and costly to use as dry surfaces are required for proper bonding to occur. They also raise health and safety issues regarding working with solvents in confined spaces.