Making coffee at home can be a very rewarding experience... or a potentially frustrating one.

Often, it's not the beans that are at fault, but small details in the preparation that end up ruining what could be an excellent cup. Here we compile the most common mistakes along with concrete solutions to avoid them.

1. Using old or poorly stored beans

The mistake: Buying too much coffee at once or leaving the beans exposed to the elements and air.

What happens: Coffee quickly loses aroma, sweetness, and complexity after roasting.

How to avoid it:

• Buy beans in quantities you'll consume within a few weeks.
  

• Store beans in airtight containers, away from light, heat, and humidity.
  

• Always grind just before brewing.

2. Incorrect grind

The mistake: Using the same grind size for all methods.

What happens: A grind that is too fine can cause bitterness from over-extraction, while one that is too coarse results in a weak or unbalanced cup.

How to avoid it:

• Use a burr grinder for a consistent grind.
  

• Adjust the grind to the method:
  

• Espresso → fine
  

• V60/Chemex → medium
  

• French press → coarse
  
  

3. Inadequate coffee-to-water ratio

The mistake: Brewing "by eye."

What happens: An unbalanced ratio can leave the cup diluted or over-extracted.

How to avoid it:

• Use a scale.
  

• A good guideline is 1g of coffee : 15–17g of water (for filtered methods).
  
  

4. Poor water quality

The mistake: Using water with chlorine, strange flavors, or poor mineralization.

What happens: The taste of the water can dominate or mask the nuances of the coffee.

How to avoid it:

• Use filtered or bottled water with low mineralization.
  

• Avoid distilled or very hard water.
  
  

5. Incorrect water temperature

The mistake: Pouring water that is too hot or too cold over the coffee.

What happens:

• Water that is too hot burns delicate compounds → bitter flavors.
  

• Water that is too cold doesn't extract enough → flat flavor.

How to avoid it:

• The ideal temperature is between 90–96°C (just after boiling).
  

• If you don't have temperature control, boil and let it rest for 30–45 seconds before pouring.
  
  

6. Dirty equipment

The mistake: Not regularly cleaning grinders, coffee makers, or portafilters.

What happens: Old oils and residues oxidize and contribute stale or unpleasant flavors to the cup.

How to avoid it:

• Wash removable parts after each use.
  

• Descalcify and perform deep cleaning periodically.
  
  

7. Skipping the pre-infusion

The mistake: Pouring all the water at once in drip or pour-over methods.

What happens: Extraction will be uneven, and some parts of the coffee will be over-extracted before others.

How to avoid it: Dampen the coffee with a little water and let it "bloom" for about 30 seconds before completing the pour.

Conclusion

The best coffees can shine at home if we avoid these common mistakes. The freshness of the beans, proper grinding, precise ratios, quality water, and clean equipment are pillars that make the difference between a routine cup and a true expression of origin.

If you find that you need to adjust your equipment —grinder, scale, filters, kettle, or filtering system— we have prepared a selection specifically designed to improve home brewing. Click here to explore it.