Water Quality; Water Values; Determining The Water Hardness - Schaerer Coffee Joy Operating Instructions Manual

Water quality

CAUTION!
Risk of machine
damage!
BASCJ_EN
V01 | 02.2011
Water quality
A cup of coffee consists of 99 percent water. Therefore, the water has a significant effect on
the coffee's taste. To obtain an excellent cup of coffee, you need excellent water.
The water is important not only to the taste of the coffee but also to the coffee machine itself.
Poor water quality can lead to permanent machine damage.
Therefore, close attention needs to be paid to the water quality in order to obtain high quality
coffee and protect the coffee machine.

Water values

Poor water values can lead to machine damage.
It is imperative that the specified values be complied with. Otherwise, Schaerer AG shall
not accept liability.
The following water values are a precondition for the correct operation of the coffee machine:
• 4 – 6°dKH (German carbonate hardness)
• 7 – 8°dGH (German total hardness)
• pH value 6.5 – 7 (pH-neutral)
• Chlorine content max. 100 mg per litre
Water is referred to as hard or soft depending on its composition. The hardness of water is
referred to as its total hardness.
The total hardness is differentiated into carbonate hardness (temporary hardness) and non-
carbonate hardness (permanent hardness). In terms of the water hardness, the concentration
of bicarbonate anions (HCO3−) is of special significance. The concentration of bicarbonate
ions or the equivalent quantity of alkaline earth metal ions is referred to as carbonate hard-
ness.
International conversion table
(factors apply to total hardness and carbonate hardness)
Unit
German hardness
English hardness
French hardness
Part(s) per million (USA)
Millimole per litre
sauer
0
pH scale
If the water values do not correspond to the above-mentioned specifications, the water must
be prepared accordingly (decalcification/enrichment with minerals).
The service partner can provide detailed information on filter options and versions and can in-
stall this equipment at your location.

Determining the water hardness

A water hardness test must be performed to determine whether a water filter is needed. If the
water values are poor, trouble-free operation of the machine cannot be ensured.
° dH ° eH
1°dH 1 1.253
1°eH 0.798 1
1°fH 0.560 0.702
1 ppm 0.056 0.07
1 mmol/l 5.6 7.02
neutral
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° fH ppm mmol/l
1.78 17.8 0.1783
1.43 14.3 0.142
1 10 0.1
0.1 1 0.01
10 100 1
basisch
14
43