Private Home: This is water coming into a private home. Water can either come from a municipally treated water supply or it can be drawn from a well. Water coming into a home via a well does not usually fall under the drinking water regulations, therefore it is up to the home owner to ensure that the water is being disinfected. 

Light Commercial: This is water for a facility that ranges between 30 to 80 gallons per minute. A facility usually supplies water to the public and can range from a day care center to a small distribution system. Some light commercial establishments fall under the drinking water regulations and UV systems can require third party validation to prove their performance.