Rainbow had assumed that the waving water in the tank was meant to keep it fresh and sweet. She knew that if it stood still for too long, it would become sour. From time to time the mistake had been made to let sour water being pumped into clouds and got released over the land, creating the ever so hated 'sour rain'. The corporation had to fill in dozens of forms and files explaining just what went wrong and those got send to the princesses as an official explanation and the highest officials of the company had every desire but to do something like that. For one, they never liked paperwork. And for two, it dented their pride more than anything.