 The little donut shape is a sustained release product. So it'll keep working for 30, 40 days until it dissolves away. The mosquito bits are more of a one-and-done, but they're very fast-acting. So if you have an area that you see that already has mosquito larvae in it, we recommend don't put a dunk in first. Throw the bits in because the bits, it's actually a corncob granule.