| In my case there is definately not a lack of filtration nor do I have too many fish in the pond. I have a seriously big filtration system holding 400 liters of K1 in two Nexus's as well as a trickle filter holding another 200 liters of bio-balls. The 30 ton pond only hold 15 koi with an average size of 70 centimeters. The problem was definately non-functioning UV's.
I would not agree that if the UV is burning it is working. In my case all three of the UV's were in fact emitting a light. The light was fairly dim but it was on and shining. As soon as I replaced the ballast, using the same UV tube, the light turned from its dull shine to a bright shine.
I do not know if there is a way in which one can measure the output of the transformer in the ballast but I would recommend that you replace the ballast and see the difference on the brightness of the UV. It certainly sorted out my problem. |