the yield is related to the size of the root ball, yes ... bigger pot, bigger roots, bigger yield ... the 'fizzy water' doesn't really help anything, I tried it, quit it ... waste of money ... if growing in a small cabinet, you can mix water, sugar and yeast, in a bottle, with a small hole in the cap, for some CO2 ... also, no visible improvement :wtf: ... regardless, the 'experts' say adding CO2 only has a significant effect on the plants, IF 'everything else is perfect' ... it's the last step in perfecting the garden ... good growing ! :smokin: