Emptying the toilet is a tiny bit of an art.This is what I do:
1. Swivel the spout so it is over the pan when I take the cap off in case it drips.
2. Flush the toilet.
3. While the toilet is flushing, press the air button and pour the cassette out so it spirals down the pan at an angle. This stops splashing.
4. When the cassette is empty, leave it resting in the toilet (spout down) while the cistern refills.
5. Flush the toilet again with the spout still in the toilet. If you were to flush the cassette out, I guess you would do that first but I never do.
6. As the second flush happens, use the flushing water to rinse out the spout cap.