co2 mixture for a 3.8 L bottle...

im a lil confused. i read through that and did not see anywhere that is says how much yeast. i got 2-2.5 cup of sugar, im guessing since its talking about a 2L bottle that it would be somewhere near 2L of water. but i did not see the amount of yeast. also, does adding a multivitamin or some sort of nutrient for the yeast really help?
 
what do you mean by hydrate the yeast? you mean mix the water and sugar together first, then add yeast and mix, then add to the bottle? also, should the water fill the bottle all the way, or should i be leaving a little bit of air in there? im a lil worried about the mixture going up the tubing into the water.
 
Hydrating the yeast means to soak the dried yeast granules in warm (80-90*F) water to activate it before adding it to the solution.

And no, you should leave at least a few inches of head space in the bottle to prevent the mix being pumped into the tank in the event your mix foams at all. With that small amount of yeast, it shouldn't foam. If you're really worried about it, build a gas separator.
 
ok, so i made the mix as per bk's instructions. 3.25 cups of sugar, 1/2 teaspoon yeast, hydrated the yeast and all that. how long should it take before i starts seeing bubbles? i am using a limewood airstone to diffuse under my canister intake.
 
Usually within a few hours, definitely within 24 hours.
 
ok, cool. so i woke up and there were bubbles. so far so good. my only concern is that with the airstone under the filter intake, the filter is making a little bit of a weird sound from the air bubbles going through it. is it bad if the filter is making sounds cause of the co2, it just sounds like there is air in the filter or something.
 
When you run gas bubbles into the filter, it makes sounds like there's gas bubbles in the filter. It probably won't hurt the filter, the noise would drive me nuts though. You could try putting the limewood block under the filter return so they get taken by the current, that might help with dissolving the CO2 while keeping it out of the impeller.
 
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