Solution

• Gypsum (Calcium sulfate) : It is specifically used to clear turbidity caused by suspended particles in water. It works by coagulating the suspended particles and causing them to settle, without significantly lowering alkalinity or pH.
• Lime (Calcium hydroxide or Calcium oxide) : Lime is primarily used to increase alkalinity and pH levels. While it can clear turbidity by precipitating fine particles, it also raises the alkalinity significantly, which can disrupt the pond's ecological balance if alkalinity is already sufficient.