Written by James F. Burns
The first thing to do is to make sure that the reason the water appears to be muddy is because of soil particles and not a result of algae.
Is it mud or algae?
Algae in a pond should be a light green color, or a slightly golden brownish green if diatom algae is present. In most cases here in the U.S. what we expect to see is the light green unless you have used nano silicates from Nualgi.
The sources of turbidity or muddy water
If the water is indeed muddy, you should first solve the mystery of why it is muddy.
Bare banks and inlets
Bare banks and inlets, or adjacent bare feilds will often be the cause. If this is the case, vegetation will need to be established in those areas, or all the water clearing methods in the world will not solve the problem.
Turbidity causing fish
In some cases certain types of fish may be causing the problem, and they will need to be removed by a qualified company with the proper equipment for the job.
After this problem has been dealt with, the serious work of clearing the soil particles can begin, if it is still needed. The process is known as flocking. Flocking is the use of a product that will bind with soil particles, and drop the soil particles to the bottom of the pond. The most common agent used for this purpose is alum.
Flocking agent amounts and water volume
The amount of allum needed is determined by the size of your reservoir, and to some extent, the severity of the turbidity. You will need to know the surface area of your body of water, as well as it’s average depth to determine the amount needed.
Application involves broadcasting this over the surface of the water.
For specific reccomendations in your area, you can consult your agriculture extension agency. These folks have a wealth of information on such topics, and are more than happy to share their knowledge, so give them a call.