I've been growing in hydro for about 4 years and just got a ppm meter so no you dont need one but I'll tell you there real nice to know exactly what your working with. There only about $40-$50. Use GH 3 part nutes there cheap and reliable. If you follow this link its a great recipe to use.

http://boards.cannabis.com/hydroponi...iscussion.html

Its a little confusing so if your interested I can give you a simplfied run down of what to do.
socialistpete Reviewed by socialistpete on . Homemade Hydro MindF**k Hey everybody! I have some questions that I need help with... to start with you may want some info on my situation: Over the past couple of weeks I have been researching a bunch of the hydro setups and grow tents/boxes etc..., and I have decided to go with the DWC method because it seems relatively simple and doesnt require a water pump. I plan to build a system myself, including a cabinet. I am trying to keep things stealthy and cheap, (advice?) so the cabinet will be about 2x2x3(I only plan Rating: 5