Problems

Algae grows where light reaches the nutrient solution. Green slime on the walls of the reservoir or channels is a sign that light is getting in. How to Stop It Use an opaque reservoir, and cover any gaps where light enters. Cover channels and net cups where possible....

Brown, slimy roots that smell bad usually mean root rot. The most common causes are too little oxygen and water that is too warm, often together. How to Fix It Add aeration with an air pump and air stone, or improve air exposure in the system. Cool the reservoir and...