Fixed the hyphenations and as many capitalization errors as I could, and the maximum capacity had been updated before your post.
As for the toilet, there are mechanisms which make certain that it all works correctly, which I would rather not explain- an article describing exactly how all that works would probably be longer than the article for the shuttle, and I don't want to do that over a toilet.
As for the gravity- It cannot fail, the gravitational plating works with or without power. If the gravity were to fail, it would be because the floor and ceiling have separated from the walls, and the toilet would be the least of your worries.