The good news: my UV bulb arrived quickly and safely. The bad news, it didn't turn on. When I called Fresh Water Systems, they told me I had to go back to the manufacturer to get a replacement - I hate when the company I purchase from doesn't stand behind what they sell. They advised me that it might be my power supply; that it takes more power to turn on a new bulb, than the one currently in use. So, I ordered another bulb that also did not come on. Now I have to order a new power supply - my 2.5-year-old Master Water Systems UV power supply has apparently crapped out!