Don't buy pre-ground coffee: Here's why
Beim doesn't sell pre-ground coffee. Here's why: ground coffee goes stale much more quickly than whole bean coffee. If you grind your own coffee beans, just before brewing, you're ensuring that the coffee will taste fresh. In my humble opinion, the convenience of pre-ground coffee is not worth compromising freshness. So, if you want to make the best cup of coffee possible, don't buy pre-ground, and grind your own beans!
What kind of grinder should you use? That depends on a few factors. If you're grinding for espresso, you'll need a different grind than if you're brewing drip coffee. Electric grinders are more expensive than manual grinders, but they're also much faster.
Use a burr grinder instead of a cheap "helicopter blade" or "chopper". A burr grinder will be more consistent. The high RPM of a "chopper" generates too much heat and creates inconsisent grind sizes. This will cause your coffee to be unevenly extracted.
Don't have a grinder? We sell the Knock Aergrinder, the best hand grinder in the world.
If you're like most coffee drinkers, you probably don't grind your own. But if you care about freshness, it's worth the effort.