ok, how much does c02 increase your yields? does it tighten up your buds dramitically?i have a space of 4x4x8 with 7 plants going under a 600watt hps. iwas thinking of purchasing a c02 boost bucket . would it be worth it?? my temps are running between 78-82. im vegiing now and would like two veg until there about 2ft tall. what could my temps run at with the c02 boost on? and when is it best to apply co2? right when you start flowering or when you are a few weeks into flowering??

With a propper co2 system you can increase yields by 20% and your buds will be even larger. Im not sure what kind of numbers the Bucket puts out, you want to make sure your not exhausting and air from the cab when the co2 in on, i would start it at the beginning.

so is the c02 boost worth it for my situation?

anyone is this worth it? and when should i apply it? right when i go in to flowering??

CO2 benefit depends on grower experience, and light levels.. If the intensity isn't too high to supass the available CO2 need then it won't do much.. Also, ppl who post threads asking about specific yield increases tend not to get the benefit they'd like because of other short-comings.. Sorry to be blunt, but plants grow, and we harvest, then we find out what our yields are if we own scales..
A boost bucket isn't really high end CO2 addition though, and buying something that can be made for $2, then drank up, seems dumb to me..