Like almost every pond owner has seen my pond water turned into a green broth, so that one has ever seen nothing more, neither fish nor plants. I have the UV light filters mounted (very easy) and about 2 days later were already seen ordinary results, after about 5 days, the water was crystal clear and it is even now one of my fantails always had problems with bald spots, these have been I use completely disappeared the unit. The cleaning of the device is also a breeze, only one should be careful that water does not enter the glass bulb. I can Berlan the UV-C light filters only recommend, because could not be better!
