Mauk 748 light filter UV-C 36 W, 6000 l / h produces a very good cleaning performance in our pond. However, the light means to be renewed in otherwise almost no work is performed once. Sometimes the lamps burn even faster by which I now use Philips. Unfortunately, it can also happen that bursts the glass bulb that is happening now after 4 years with me. So unfortunately water has come into electrical areas and the UV lamp is completely defective. Well I bought the filter again and hope he holds now.
