Sign on a Pool Fence

Observations:

Active diarrhea must be a recurring problem to have merited nearly a third of the space on the sign.

Pool closures resulting from diarrhea are generally caused by kids, most of whom can't read the word.

"Active" diarrhea is verboten; does that mean inactive diarrhea is permitted?

"Active" and "inactive" are adjectives applied to volcanos.

Volcanic diarrhea! the monkey mind flits from image to image, unable to stop, as it plunges into deep waters by the pool.