Have the TIP WDF pond external filters installed for nearly 4 weeks and unfortunately the water quality of our pond has improved not noticeably (ca. 3600 L with 3 fish). Initially saw it quite good because the water was clear relatively quickly, but now the water is again as green as ever. We have run the device at first for a long time (about 8 hrs. Per day) but now there are daily. Then only about 3 or 4 hrs.. Because nothing improves, it ripples just nice because the declining water over rocks again from flowing back into the pond. Even repeated washing the foam filter has brought no improvement. Can we not explain what the problem is until now, sometimes professional help will probably have to take. The assembly, however, was described quite simple and good. Can, however, with the current state of this device is not recommended!
