[quote=“sunshine22”]Thanks for all the help. I was just trying to get a general idea because I don’t have a hydrometer so I was just going to go by simply looking at it and making sure there is almost no activity in the airlock nor the carboy…is this okay?
Thanks[/quote]
Don’t go by what the airlock is doing. It’s a fool’s prophet.
Timing is good when you know how the process should go (and what your temps have been). Times for Ales vs. Lagers mentioned above is a good point (assuming you are fermenting the lagers at a lower temperature).
Best way to do it without a hydrometer is give it the full three weeks. Then look at the beer. Should be clear with no signs of fermentation.
Keep in mind I did use a hydrometer for years before not bothering. I have a good feel for timing and what to look for in the finished beer. You will too after some experience.
I don’t see a huge problem going blind here, but if you are ever unsure, gravity is the only real sure fire way to go. If you ever go to doing more complex fermentations - lagering / lambics / high gravity / bacteria etc. then a hydrometer would be a must.