Posted on November 3, 2007 by stormyBuilding a huge koi pond We were going to help move a 600 pound koi pond. I thought we’d pick up some little pool and put it in a hole in the ground. Turns out the rubber sheet alone was 600 pounds! It was 40′ by 50′! Related posts: Calories In, Calories Out. Not? Building a secret apartment in the mall My Pants Fell Off!