Clarification of the water, suspended particles clump together after hours (pond size about 18 square meters), form flakes that only acutely on and in the water are visible after 24 hours everything is clear, the filter flocculated particles are retained. Tip: 1. easy to overdose (1.5-2 times the amount recommended doses apply), 2. Clean the filter by application, 3. PondStarter bacteria before restart of the filter in the filter. With these measures, I had a great result (clear pond, view down to the bottom, about 1.30m).