Our community water system has several steps to ensure us of safe, reliable drinking water.
First, it is filtered through a 5 micron filter to remove sediment.
Next, it is filtered through a 1 micron filter to remove cryptosporidium & giardiacysts.
Then, it passes through ultra violet light to sterilize for bacteria and viruses.
Because our water passes through these steps we are able to minimize the amount of hypochloride, which is the last step, that we must put into our water to keep it healthy as it is distributed and stored for household use.
All these processes are fastened to a 4' x 8' sheet of plywood in our water building and are modular in design so they may expand as the need arises.
http://www.scrd.bc.ca/infrastructure_water.html#watersupply.
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