Just use the spoon that's in the container and don't overfill it. When I dose Coral Balance, I take a 250ml sample of tank water and a spoonful, then press it up against the side of the container to flatten it out and add it to the sample. Shake it up really good and pour it in a high flow area. I've noticed that it won't dissolve completely, but this never proved to be an issue for the tank.