Manual Vibiemme Vibiemme Double Domobar version 3 (page 50 of 74) (English)

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Too Slow

Here is a pull that lasted a long time and yet hardly an ounce was produced even though this was a double

basket and we should have double that amount in the cup. This photo was taken after about thirty seconds.

Notice the dark, viscous ﬂow which is a sign of over-extraction. This will usually result in a harsh taste that

few would enjoy. Possible causes of this slow ﬂow extraction could include:

• Coffee ground too ﬁne. Adjust the grinder one or two clicks (or settings) more coarse and try again.

• Worn or inaccurate grinder burrs. Old, worn grinder burrs or a low-quality grinder can create a lot of

dust in the grind. This dust migrates towards the bottom of the basket during extraction and clogs the small

openings, dramatically restricting the ﬂow of water. This also results in a very bitter beverage because of

the “ﬁnes” that end up in the cup.

• Low pump pressure. Although not likely, this can be caused by a mis-adjusted or faulty pressure relief

valve on the rotary pump.

• Clogged ﬁlter basket. If enough of the holes in the ﬁlter basket are clogged it can slow the ﬂow sufﬁciently

to make proper extraction difﬁcult or impossible. Wash and dry the basket and examine it by holding it up

to a strong light source. If clogged, soak it overnight in espresso machine cleaner (See Chapter 19). If that

does not correct the problem you can try using a pin to carefully clean the holes. If that does not work, re

place the basket.

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Vibiemme Vibiemme Double Domobar version 3 Manual

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