To ensure adequate water pressure and supply, Toronto is split into six pressure zones and subdivided into 13 pressure districts, which are continuously monitored and adjusted based on demand. To ensure an uninterrupted water supply, there is a computerized process control system overseen by Toronto Water staff. The aim is to distribute superior quality water in a reliable, cost-effective and environmentally sound manner. phosphoric acid, which is used for corrosion control to help create a barrier between residential lead pipes and drinking water.ammonia to ensure chlorine levels remain consistent as water travels through the distribution system.chlorine to destroy bacteria, algae and viruses. ![]() Before water is pumped for distribution to homes and businesses, the following is added:.The clear water at the top proceeds to filters containing gravel, sand and carbon to remove suspended impurities and bacteria. The water travels though settling basins so larger particles settle to the bottom.Alum or Poly Aluminum Chloride is added to the water to form a jelly-like substance that joins larger particles called floc, and goes through additional filtration. ![]() Water is disinfected by using either chlorine or ozone. Lake water passes through screens to remove large debris and then through filters to remove additional impurities. ![]()
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