Delta Cooling Towers says it has developed an anti-microbial HDPE material that substantially reduced risks associated with Legionnaire’s Disease and other strains of deadly pathogens.

Delta, known for its HDPE (high-density polyethylene) plastic cooling towers introduced in the 1970s, has just launched a line of towers constructed of anti-microbial resin, which is fully compounded into the base cooling tower material. The anti-microbial resin contains additives that operate on a cellular level to continuously disrupt and prevent uncontrolled growth of microorganisms and biofilm within the cooling tower. According to the company, efficacy tests were performed by Special Pathogens Laboratory, The Legionella Experts®.

Company officials also said that while cooling tower conditions are often managed by water treatment chemicals, such treatment is sometimes inadequate and poor piping designs can lead to “dead legs,” creating an environment in which pathogens — including Legionella — can thrive. Stagnant water areas are prime breeding grounds for Legionella to grow. To avoid such problems, Delta’s cooling tower designs feature a sloped basin and/or basin sweeper system.