Calix PROTECTA-Mag corrosion protection for manholes

PROTECTA-Mag is a concentrated, controlled-viscosity, stabilised suspension of magnesium hydroxide. It prevents corrosion by raising manhole surface pH, thus inhibiting the formation of acid-producing bacteria (eg, Thiobacillus concretus).

The product contains special ingredients to allow it to adhere to concrete surfaces and set into a durable film. It is hydrated from Calix reactive magnesium oxide, imparting good neutralisation capability due to the high surface area. Spraying is carried out without stopping flow of the sewer.

The overspray of product entering the sewer flows is complementary and beneficial for any downstream sewage treatment plant (STP) and odour control. Magnesium hydroxide is non-hazardous and non-dangerous, thus preventing occupational exposure to toxic or harmful chemicals.

According to the company, initial monitoring results indicate that a sacrificial magnesium hydroxide coating continues to protect the integrity of concrete sewer pipes in spite of continuous sewer flow for more than three years; for manholes, the protection can last more than five years.