The water need to go potty and the toilet is closed.
Water can't hold it any longer and start to deposit his muds in his pants. The water is pooping itself. "Bad water, that is not done.
The water says: "sorry, i couldn't hold it any longer and it's getting away from me"
one stinky layer of sediments are deposited in their panties.
Since it doesn't matter, water finish what's left on purpose.
After this, the water was completely clear and clean while her underwear ended up full of sludge.