Troubleshooting Flavor
Bad cups usually point to extraction, strength, freshness, roast fit, or water. Change one variable at a time and taste again.
Sour, sharp, or salty
This usually means under-extraction. Try grinding finer, using hotter water, blooming better, adding agitation, or increasing brew time.
If the coffee is a very light roast, it may need more heat and extraction than a medium roast.
Bitter, dry, or harsh
This usually means over-extraction or too much roast bitterness. Try grinding coarser, using cooler water, reducing agitation, or shortening contact time.
For dark roasts, cooler water and a gentler recipe often help quickly.
Watery or thin
Watery coffee can be too weak, under-extracted, stale, or brewed with too little coffee.
Try a tighter ratio first if the flavor is pleasant but weak. Try finer grind if it is weak and sour.
Muddy or silty
Muddy cups often come from too many fine particles, too much agitation, or a grinder producing uneven grounds.
Try grinding slightly coarser, pouring more gently, or using a paper filter if your brewer allows it.
Flat or dull
Flat coffee can come from stale beans, old ground coffee, poor water, or not enough acidity for your taste.
Use fresher coffee, grind just before brewing, and try a slightly finer grind or hotter water if the roast can handle it.
Quick reference
Sour
Grind finer, hotter water, longer brew.
Bitter
Grind coarser, cooler water, less agitation.
Watery
Use more coffee or extract more.
Muddy
Coarser grind, gentler pour, better filter.
Flat
Check freshness, water, and extraction.