Hydroponics materials in China
Hello, I am a teacher in Shanghai China. I have been searching for a place to buy materials to have my students (high school) build a small hydroponics set-up. I have never done it myself before but I am sure that the basic materials for 'building' I may be able to get my hands on such as aquarium water filter etc. What I would really like though are 2 things:
nutrient solution (no idea how to do this myself)
Expertise (anyone who I could consult for questions/problems etc)
Any information would be much appreciated.