...yeah my friend said he would come over with his "brain" and we could fuck around and see how long it takes to hit 1000-1200 PPM and then I could just write it down and continue to do the same exact thing every time, and the math should stay relatively the same.

He also said the math on the back of the box is actually pretty accurate if you just enter the cubic feet of your room into the equation correctly.

Anyone have any experience? Let me know!!

I am also a bit concerned about harming the plants with TOO much c02 if I'm unable to test the air, but I've read on a few different sites that they can only absorb so much c02 and it's really hard to fuck them up with excess c02. Is this true? I thought I read in the past the PPM of the c02 can never exceed the PPM of your nutrient mix, but since I do organic I never test my water... simply put my nutes in and do what the ladies tell me... a little burn and I back off, so far so good on this run!!!