Before revision: During the dissolution testing, "sink condition" is a requirement, otherwise when the concentration begins to get too close to the saturation point, even though the total soluble amount still remains constant, the dissolution rate will gradually begin to reduce significantly, corrupting the test results.
After revision: During the dissolution testing, "sink condition" is a requirement, otherwise when the concentration begins to get too close to the saturation point, even though the total soluble amount still remains constant, the dissolution rate will gradually begin to reduce in significant amounts, enough to corrupt the test results.