One of the most important things you can do to maintain the health of your pond is to be aware of how it behaves and changes throughout the year. One telltale sign that your pond is going through a natural process called turnover is that the water will start to look cloudy or murky. This happens when the bottom of the pond, which is typically full of decaying matter, becomes exposed to the air. If you see this happening, don't worry - it's a normal process that all ponds go through from time to time.