greetings.
the co2 production is pretty simple, depending on the size of your aquarium, you can use anywhere from a 500 ml bottle to 2 2 liter bottles or even more, or different sizes etc. but the bottles sould be soda/fizzy drink bottles because they can withstand pressure of hold the yeast and sugar water that creates the co2. then you need a 500 ml bottle to act as a bobble counter, it sould be filled half with water so the tubes leading from the production bottles lead into the water in the bobble counter, that way, any yeast flowing out (although this is rare) will get caught in the water of the bobble counter.
you sould use co2 hose, but i can't tell you what the american standart size is. regular silicone hose works too but more and more co2 will escape from the hose as it ages, co2 can't escape from a co2 hose.
in my setup i drilled holes in the bottle caps just wide enough for the hose to be put in, and used superglue to seal it up. i have 2 2L bottles of yeast with hoses into a 500 mL bobble counter that has a hose into a forced reactor that mixes the co2 with the water outtake of the filter. my aquarium is 55g
but you can also use different methods of getting the co2 mixed with the water, a reactor is most effective. then a ceramic difussor, least effective is a airstone/co2 ladder and not effective at all is having the hose floating around inside the aquarium.
for the sugar/yeast mixture i am currently experimenting, but a 5 gram yeast and 250 gram sugar mix lasted 9 days for me.
edit: i forgot you need non-return / one-way valves to keep pressure in the system and to avoid the co2/water flowing in the wrong direction. these sould be on each hose.
sincerely,
nereksnad.
