Press start and wait. Each time you press start, the sample of waste water changes, so pressing start multiple times shows multiple combinations of organisms.
I viewed a sample of waste water through a microscope, and these microorganisms were what I found in it. I though it would be fun to create on Scratch, so I built this. Please comment. Update 25 April 2022: Found and fixed an issue where the number of bacteria could exceed the 300 clone limit.