Various methods exist for effective pre-treatment. The objective of pre-treatment is to remove contaminants from raw water that will affect the stability and performance of the main treatment process and to remove contaminants that will affect the performance of the main process. Filtration may be used in the treatment of industrial effluent, process water, municipal wastewater and drinking water. It is also used as a pretreatment step to membrane processes and desalination of seawater.
- Manganese Dioxide: For the removal of iron magnesium and other heavy metals.
- Water Softeners (Water Conditioner): For the removal of calcium.This method is usually applicable where heat elements are present such as boilers and geysers.
- Carbon Filters: Used mainly for chlorine removal and other organic gases and to clear up the taste of water.
- Sand Filters: Used mainly for the removal of sediment from water. Water disinfection means the removal, deactivation or killing of pathogenic microorganisms. Microorganisms are destroyed or deactivated, resulting in termination of growth and reproduction.