Membrane Softening Process
Pretreatment

During pre-treatment the raw water is dosed with acid and anti-scalant and then filtered. The acid and anti-scalant reduce the pH of the water and prevent minerals from clogging the membranes. The minerals are captured by the membranes and are rejected to the waste stream. In addition to the chemical treatment, the raw water is also passed through large cartridge filters to remove any particulate matter larger than 5 microns prior to reaching the membrane softening or reverse osmosis units.

So now the water enters the treatment units.