My wife found this first and told me about it. Did I research and read a lot of reviews? Yes! We got a positive coliform result back from a water sample I submitted to the lab. I already had a filter and an electric device in the hot water heater to replace the anode rod. It had been working ok and eliminated a lot of the sulfur smell. All other tests came back ok. So, I bought this system and installed it. I also installed an extra filter into the system. There's nothing difficult about doing this. Just measure where you want to install it, plan it out, go to your local hardware store and get what you need. I waited a few days then took another sample for the lab and everything came back with glowing results! No coliform and no e-coli. The UV light is zapping everything plus the smell is negligible.