A Health or Cooking class would be a great place for a Wick system- they are ideal for herbs and spices!
A Physics classroom could use a Wick system to illustrate wicking, one of the basic properties of water.
Biology classes often illustrate the start of life by growing small seedlings -- with a hydro system in the classroom, students could watch their seedlings become full-fledged flowers and vegetables!
Check out my article on Wick systems to find out some more fun experiments you can try out!
Are you a teacher or student looking to bring hydroponics into the classroom? Have you done this before and want to share a story? I'd love to hear your questions and read about your experiences, please share in the comments below!