How did I never think of this before? Complete genius!!
Not only does she want to play with it a lot longer, the bubbles camouflage any leftover sand/dirt/tree bits in the water. And? Soap keeps away the mosquitoes. Win-win, I say!
Not to mention that the constant agitation of the water by the sifters and waterfalls and whatnot makes MORE BUBBLES.
What kid doesn't want more bubbles?
(*now with bonus bubbles!)