I use an Ulta-Pur UV system on Bear Island. I have a sediment/alge filter at the pump. My UV unit has 2 pre filters a 10 micron cloth filter and a 5 micron carbon filter. The carbon filter removes MTBE and other volitile organic compounds. It also remove cysts that will not be killed by the UV. I've used mine 2 years now and have determined that I need to get my intake deeper where alge is not so prolific. Other than that I start the season on new filters and change them at mid season. I purchased the unit on line for around $750 with extra light, light tube and filters to go one season. Installation was just cut into the line into the house and plumb up. I used PVC so it was easy to remove.
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