I use a Red Sea Turbo CO2 injector for my planted aquariums. The brand name
media for this 1 l reactor cost $9 a pop and is rated to last a month. Are
there any comparable and cheap home recipes for C02 that will last equally
as long as the brand name Red Sea media?

Honestly the 240 g of "Media" and and 1 g of "Activator" substance Red Sea
sells looks like nothing more than sugar and yeast. Most of the recipes
I've found on the Web just call for sugar and brewers' yeast, but they
aren't rated to last for a month. Is there something else Red Sea includes
or is it just a con?