Once your pool water turns into something that looks like milk, or worse, you need to act. The change in colour occurs slowly, until one day, you cannot see the bottom of the pool. Not only is this an ugly sight, but it also means that your pool is a breeding ground for dangerous bacteria. If you don't handle the issue on time, the water will damage the circulation system. To avoid expensive damage and acute illnesses, call in a professional in swimming pool maintenance to figure out the reason behind the murky water.