I think that "Ten mężczyzna czyści basen" would be more accurate, but both sentences are correct.

It probably isn't a good translation here, but could "sprząta" mean "he tidies" in another context?

Pool cleaner? Ah, the jokes almost write themselves...

My answer was wrong because i didnt put "swimming" in front of "pool". I think most people would assume "pool" means the kind for swimming without the extra word (as opposed to a pool of blood or something).