The UV sterilizer is supplied with two ballasts. Less than a year later, the first stopped working. I replaced it with the replacement ballast that came with the UV. I then ordered this ballast as a backup, as it will probably only last a year. The second ballast lasted just over 8 months. I opened up this ballast which I received last December for backup. Lo and behold, it didn't work right out of the box. I think I should have tested it before saving it for backup. I am ashamed. I have 2 HQUA ballasts that have failed and the 3rd that failed on arrival. I think I'll have to look at another brand as I haven't had any luck with HQUA.
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