Some types disperse more easily than others. Some have to be mixed with water before application whilst others can be sprinkled directly onto the pond surface. The pond will clear in about 6 - 10 hours, depending on the amount of organic material in the pond, but the montmorillonite will remain active. Do not be worried in a new pond if the water does not clear in a day or two. Also the clay can be mixed with the food.
Coat damp pellets lightly with montmorillonite.
Feed a few times a week. Use the recommended dosage on the packet of the product you have bought. But I must relate a story. The family Doberman did the right thing by examining this unknown object and the packet was pushed into the pond. So I had an instant dosage of about a kilogram of montmorillonite in 20000 liters of water.