Found something I will share..would have to search my history for the URL ref..
Edit: Cant believe I pasted that whole thing sorry..
In-line UV Sterilization
Another option is in-line UV sterilization, which allows you to sterilize your lines and the water that flows through them. This means that your water is treated as it flows into the treatment area. This configuration is helpful when using beneficial microbes in your set-up and reducing the problems with nutrient reduction as it may not be as impactful. However, if you already have a problem with algae, bacteria, or fungi in your overall system, this setup does not help eliminate it. Any algae attached to the walls and other surfaces needs to be removed another way.
Biggest Drawback with UV Sterilization
One of the biggest drawbacks in using UV sterilization is that it can deplete some of the things your plants need to grow healthy and strong. Iron, boron, and manganese deficiencies can occur when using UV sterilization. Also, UV sterilization reduces the populations of any beneficial microbes in your hydroponic set-up much in the same way it does the fungal, bacteria, and algae populations. It’s beneficial to test your hydroponic system for these deficiencies to help minimize them.