Yeah, I figured that about the pots. How do I calculate ppm? I must need some kind of spendy device eh? I've heard people say "don't worry about measuring ppm if your a beginner", just make sure the pH is ok and add the proper amounts of nutrients... the ppm thing seems necessary because how is one to know when their nutes need replacement, Im just wondering if I can get through my first grow without having to deal w/ ppm?