[Cavan Allen]

It can help keep the bugs down, but it can keep the iron down too. I had plants showing severe iron deficiency while I had it on for something else despite the addition of LOTS of iron. A UV unit really isn't necessary for day to day use anyway. They can, however, be good to have on hand if certain problems do arise.

 

[Cavan Allen]

The same thing can happen when you only run it a couple hours a day. It doesn't take long to oxidize the iron. And again, it just isn't necessary. In my opinion, the money would be better spent elsewhere if money is an issue.