Any producer or distributor of liming materials in Maryland is required by law to provide the above information for ground limestone either on the bag or, if in bulk, on the invoice. They have tables or a computer program available that considers the above information and suggests the rate to apply. It is best to apply lime to a new pond before the pond is filled. The recommended amount and type of lime can be spread evenly over the entire pond bottom by use of a spreader or by hand. Never pile the lime in one area.
Ponds already filled have to be limed by boat.
If the pond is small, bagged lime can be easily spread over the entire length. Use a shovel to spread lime evenly over the pond. It is also possible to mix some types of lime into a slurry and pump it across the pond. Again, be sure to cover the entire surface. When to Apply Lime Even though liming can be done any time of the year, it is best done during late fall or early winter, after pond fertilization has stopped.