Water/Ball Slide Water/ball Slide........................................... $225.00 The water/ball slide is 13 feet high and 30 feet long. Children climb to the top of this slide on foam steps in the back of the slide. The pool at the bottom of the slide can be filled with 3 feet of water for those hot summer days. When water is used in the slide the hose is connected to the top of the slide on the arch giving the children added wet fun and faster sliding. When its cool outside, we fill the pool with 3 feet of balls. This is great fun for a church, school or just a backyard party.