LONDON (CBSDC) — Beware when swimming behind Michael Phelps.

The most decorated Olympian of all-time tells the Wall Street Journal that all competitive swimmers urinate in the pool.

“I think everybody pees in the pool,” Phelps told WSJ. “When we’re in the water for two hours, we don’t really get out to pee.”

Phelps explained to the Journal that it’s perfectly fine to pee in the pool.

“Chlorine kills it, so it’s not bad.”

Phelps’ comments come days after Olympic swimmer Ryan Lochte admitted to urinating in the London pool before competitions began.

“I think there’s just something about getting into chlorine water that you just automatically go,” Lochte said on Ryan Seacrest’s radio show last week.

Phelps – who says he’s retired after competing in the London Olympics – won a total of 22 medals over three Olympics, including 18 gold medals.