Guys remember that was in a water park commercial pool environment. In that environment it is more difficult to locate the pool pooper so it is precautionary to treat all poops as possible source of poop perpetuated illness. In a private environment it is much easier to identify the pool pooper and test for any illness others may have acquired. The pros here preach adequate chlorine levels witch will help cover some poop problems. As the article states that the solid poops are not as much worry as the liquid ones so if you see a brown cloud in the water be cautious and possibly shock the crap out of the water.
Steve