Do you have any pics of the pond? would help out a lot in us being able to help you diagnose and correct the problem.
Is it murky as in muddy looking, cloudy looking, brown tint?
What type of filtration do you have? How much circulation is in the pond? How big is the pond? How many fish in it?
Many will us fine material like quilt batting to help get the particulate matter out of the water column, depending on what is causing the murky water.