The previous owner had an ultraviolet disinfection system installed on the well pump before I bought the place. On the upside, the system quietly sits in the background (except when the fuse blows after a power outage), requires no chemicals and little routine maintenance. On the down side, the bulb does needs to be replaced annually, or so they recommend, at a DIY cost of around $100. I figured this was a trade off compared to the cost of a chlorinator and the need for chemicals. What I didn't know was the unit consumes more kW-hrs than my freezer! This is not an estimate...I measured the power comsumption of both devices with a power meter (total power used versus time). The cost is not the problem (~$40/yr), the high electrical usage is as I am planning to go off grid in the near future. Chlorine is an option but I'm not a big fan of chemicals. Are there other types out there? I'm also considering an alternate arrangement for the UV system like a timer to turn the system off at night or when no one is home or a flow switch to activate the unit on demand rather than having it on all the time which is wasteful...kind of like leaving the lights on when no one is in the room. So now that I've bored you with the details, here are some questions. Do you use a disinfection system on your well? What type do you have? What are the pros & cons of the system?