Thus far in our discussion of ultra violet (UV) units we have looked at why UV units are necessary and at the importance of the UV dose received by the bacteria.  Of course, making sure the bacteria are actually hit by the UV light is a key element in the process and this is where particle filtration comes in.

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The most important factor in determining the effectiveness of a UV unit is the UV dose that the bacteria receive.  The UV light used to sterilize bacteria is the same UV light that gives us humans sunburns.  You won't get a sunburn just walking between your house and your car because you don't get enough of a UV dose.  Likewise, bacteria won't be sterilized by your UV unit if they don't receive a high enough UV dose.  So, what UV dose is needed to properly sterilize the types of bacteria commonly found in wells?

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Aside from a well pump, the most common piece of equipment in a residential water system is an ultra violet (UV) unit.  The purpose of a UV unit is to protect you and your family from bacteria that may be present in your drinking water. 

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