Landscaping companies often have gypsum decorator rocks which are like large chat(gravel).They are approx 2" in diameter. I paid around $130-150 for a dump truck load although that was 10 years ago or more. Place them on a shore where prevailing winds create wave action. They last for years and years. There is a lot of dust formed by the rocks grinding on each other when the load is first brought in. This provides a rapid infusion of calcium ions to precipitate the suspended clay. Wave action constantly leaches small amounts from the rocks providing ongoing tubulence control. Once some clarity is achieved, aquatic plants beging to grow and further limit clay turbulence from wave action. And the rocks aid in erosion control on the shore.

Layton Runkle