Across
- 1. what is sent to the sludge treatment?
- 2. what are the bad bugs called?
- 3. what do you squeeze out of the sludge to make it a solid?
- 5. what kind off door does it go through?
Down
- 1. how do you flush the toilet?
- 2. what sinks to the bottom?
- 4. what courses can the put the water on?