i know Co2 systems can be extremely expensesive.

my question is; do i NEED Co2 system? will it make that much difference? if so, is there any way to make a cheap Co2 system? i am growing 6 plants in a closet with a 400w hps for flowering. please gimme your opinion

I hear that it can give you at least a 30% yield increase. Check out the Growfaq: http://www.rollitup.org/view.php?pg=...category&id=91

are you going to s.o.g. or grow them out?

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sum1 told me to spray the plants with fizzy water to add co2 dont no how true this is

seltzer water does work. the reason i asked about s.o.g. is that co2 is really only benaficial for vegging a bush type plant so if you s.o.g. co2 would not be nesaccary but would have minimum benifits .

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