Contaminate it with what exactly? Dead skin cells? lol You know, just because you say "no offense" it doesn't make your statement any less offensive.
Here's a 400 m long water slide in Costa Rica. Pretty cool. https://www.youtube.com/watch?v=ISNEwKp_G68"]YouTube- Water slide through the Costa Rican rain forest https://www.youtube.com/watch?v=5XuR6ouoooY"]YouTube- Fast waterslide at Rincon de la Vieja, Costa Rica .