co2 ppm wht do you use

I have used from 1500 ppm . average results. then tried 1000 ppm. lower yield . very fluffy buds now im pumping them 1900 ppm . better yields. tight buds and they look like they are going to be done 3 weeks early ! that' is huge. experienced growers please share you info with this post.

I run my co2 at 1500 ppm in flower only. I dont bother in veg. Some like to add during veg but I found no real improvement. Above 1500and its kinda waste but wont really hurt until your over 2000 ppm. As long as you use your co2 and still make your air exchanges few times a day and keep good fan circulation in there is no beating co2. I figure I get a 30% or higher increase in yeild much denser flowers and yes I see an average 1- 2 week total time shortening in total time til harvest.