I was doing some research on water chemistry in aquarium settings to better understand what's going on in my AP system and read this article: http://www.americanaquariumproducts.com/Redox_Potential.html which mentions UV sterilizers and their importance in maintaining Redox balance in aquariums and ponds. I subsequently read this article: http://www.americanaquariumproducts.com/AquariumUVSteriliz…