the 2 rooms are all different right now. room 1 is 1200ppm, room 2 is 1400 ppm, and 3 is 1500 ppm. What I find wierd is in the last 8 years I have never had any deficiencies in veg what so ever. About a month ago I go to pick up new nutes and I see an Advanced brochure, I pick it up and read it while waiting in line. It says that you can throw your ph/ppm pen away as you no longer need it with there new formula that balances PH and they have the ppm calculator on the back of the bottle. I think that is wierd and kind of unsetteling advice coming from a nute company your pen is your best friend. Why would they be promoting this. I am just wondering if they have changed there formula. I called AN they said the change hasn't taken effect yet. I even had a meeting with there rep. He took a sample of the nutes and has not got back to me yet.