The pond has a high fish population (approx. 70 goldfish) and was totally dirty with algae and mud. After 4 weeks, all fish were seen again. After about 6 weeks of floor 1.70m deep. A neighbor said: "That's drinking water quality". The filter sponges At first I had to completely clean every day, now only 1 times a week. Conclusion: The predictions of Oasis are fully arrived. I was speechless. Can only recommend this filter.
