cheap and easy CO2

aren't you sopposed to also try an experiment more than once and on many different types of things? That might be 1 of the problems.

im also guna tryt his lil experiment, and might try a few other goodies too

how long did the eggshells last roughly before u needed to change it?

cheers y0

found a few other diy theories after a search, ill try a few and see the diference :)

http://www.1stmarijuanagrowerspage.c...ow-weed-9.html
http://www.thekrib.com/Plants/CO2/co2-narten.html
http://folk.ntnu.no/foksen/co2.htm
http://www.plantedtank.net/articles/DIY-Yeast-CO2/7/

all basicly the same thing but still a good read, good info to combine and make ur own system.
with medium level co2 production lasting as long as a month it certainly is better than nothing and alot cheaper than going for a full automted co2 system

i had a bit of a read of the no mercy site zandor posted.
i thought roots wanted oxygen not co2?
if they do thrive off a lil co2 should i put in another airstone and airpump which is pumping co2 from one of these diy units?

would be good to hear ur thoughts guys, this has really caught my eye :)