Water Treatment

As the community water comes from Lake Windermere it is considered surface water it must be 4-3-2-1-0 compliant as per Interior Health.

In May 2011 we completed an upgrade to our Lake Intake and Pump House that takes the lake water intake from 40m from shore to 210m in an effort to increase the flow and to get a better quality of water to treat. We have also upgraded the pump house and pumps to ensure we can pump water more quickly and efficiently from the intake to the treatment plant.

The Water Treatment Plant has built in redundancy with two tanks, filtration systems, and pumps (trains). As a general rule the trains are run on alternate days, but in case of emergency it gives us the ability to run uninterrupted as each piece of equipment has a back-up.

Once at the Treatment Plant the filtration process begins. The Water Source diagram shows the path of the water to and through the treatment plant.

When the water enters the Plant, the water is pushed through 3 different types of filters in the Filtration System.

After a coagulant is added to the water to help the larger particles bind together (forming floc), it starts through the Tube Clarifier. This tank is filled with angled tubes that grab the larger particles (floc) out of the water, allowing them to settle to the bottom of the tank where the Sludge Sucker travels back and forth vacuuming up the particles removing them from the water.

Next the water is pushed through the Adsorption Clarifier which is filled with Food Grade Polyethylene Beads that use a static charge to attract the next smallest particles (floc). The final filtration stage is the Mixed Media Filter which consists of 18" of Athracite Coal, 9" of Silica Sand and 3" of HD Sand, which act as a Brita Filter for the water and remove the final and smallest particles (floc) left in the water. Both the Adsorption Clarifier and the Mixed Media filter are subjected to regular Backwash Cycles to clean out the debris and to 'fluff' the beds to ensure they don't pack down too much.

In the fourth step water enters the Trojan UV Ultraviolet Disinfection Reactor which uses UV rays to inactivate any waterborne pathogens including Cryptosporidium and Giardia. And finally the water then flows through the Chlorine Contact Chamber for a minimum of 45 minutes.

After those five steps the water is now fully 4-3-2-1-0 compliant. We then pump it up to the 940 Reservoir, where it is gravity fed back down the hill for safe consumption by our customers.

Mixed Media Filter

The jar represents (on a smaller scale) the ratio of the Mixed Media Filter with 18" Anthracite Coal, 9" Silica Sand, and 3" HD Sand.