The Corporation of the Town of Cochrane

Water / Sewer Services


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Water Treatment
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Facts & Filters

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  1. Groundwater is extracted by an intake pipe from three wells (#5, #6 and #7), each with a capacity of 45.3 litres per second.
  1. The incoming water (influent) is passed through the Head Tank, which allows air and gases to be removed and prevented from entering the treatment system.
  1. In the Clarifiers the softening process is undertaken. This involves removing the high iron content, manganese and hardness with the use of lime. The lime interacts with the minerals and creates “floc”. Heavy flocs drop out of the water in the Clarifier and collect at the bottom, which is flushed out to holding tanks every hour. Chlorine is also added to kill microorganisms, which may carry harmful bacteria. 
  1. In the Recarbination Tank, carbon dioxide is added to reduce the pH to normal levels.
  1. The water then passes through the filters to remove any remaining particles and to reduce turbidity (cloudiness of the water). These filters are made of fine sand, activated carbon, gravel and rocks, which form rapid sand filters. The layer of sand removes the fine bits of floc, algae and silt. The layer of activated carbon controls taste and odour.
  1. The finished water is now stored in the Reservoir that can hold 2,300 cubic metres of water.
  1. The High Lift Pumps are positive displacement pumps (pumps that “push”) that propel the water into the Distribution System to people’s homes. A safe level of chlorine is added prior to entering the distribution system to check the growth of algae and microorganisms. The High Lift Pumps also send water to the Elevated Storage Tank, which helps supply water at peak times during the day and helps to maintain constant pressure within the distribution system. The Elevated Storage Tank can hold 2,700,000 litres of water.
  1. The water in the Distribution System is tested on a weekly basis to ensure that your water is safe to drink.

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Last modified: 11/03/10 © Water / Sewer Services