Nutrafin Natural CO2 System help!

[Ilikefishes]

I forgot how much sugar to add to it, since I lost my directions haha. Anyone know? I can't find the instructions on the web.

 

[Purrbox]

There's a ridge in the canister. You fill to the top of that.

 

[Ilikefishes]

Thank you, I called my friend who set it up for me and he remembered (he also threw out the directions... now I know where they went).