Randy :
I often suggest pond bottom soil sample tests. Not for clarity reasons although it may well help you figure that out as well. I would tell the agent to have it run for aquaculture/pond mgt. purposes. That will tell you the nature of the dirt you are working with. Acid/base , missing factors, N , P ,K and other contents and how to treat the soil for aquaculture purposes. When you get the results post them and we can get the chemists and ag- specialists here to take a look. Here is a link .
http://srac.tamu.edu/index.cfm?catid=25 see:
SRAC 460 Control of Clay Turbidity in Ponds
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