Problem Cause

Over-extraction

Too many compounds have been extracted, including bitter and astringent ones

How to Identify This Issue

Ground texture and uniformity

Puck surface and distribution

Symptoms of This Issue

Not sure if this is your issue?

Get a personalized diagnosis

Adjust your grinder to produce coarser coffee particles. Make small adjustments (2-3 increments) and pull a test shot.

Expected Result

Extraction time should decrease by 3-5 seconds. Flavor should become less bitter and harsh.

Pull a shorter shot, decreasing your output ratio. Try moving from 1:2 to 1:1.5 (e.g., 18g in → 27g out instead of 36g).

Expected Result

Less extraction, reduced bitterness, more concentrated but less harsh flavor.

Remove 0.5-1g of coffee from your portafilter basket. Leave adequate headspace below the shower screen.

Expected Result

Less resistance, faster extraction, cleaner flavor profile.

If your machine allows, adjust brewing temperature. Try 92-96°C for most coffees. Light roasts prefer higher, dark roasts lower.

Expected Result

Better flavor balance, reduced sourness or bitterness depending on adjustment direction.