For clarity issues, Rapid Clear, a flocculent that is 100% safe for fish, plants or wildlife, can be used. This product is a fast acting treatment that can solve cloudy water in just a few hours by physically causing the particulates floating in the water to clump together into larger particles that can be filter out.
There are many other factors that may be the cause to these water clarity issues. Temperature (Has the temperature fluctuated in your area lately?), the location of the pond (direct sunlight/shaded) and the surrounding environment (mulch, trees, plantlife, etc.). If you continue to experience problems with your water, please feel free to call one of your local retailers or contractors.