Grafen CS20 A, User Manual, Page: 3 / 28

3
EN
NOTE: all devices that require a steady connection to water mains (including this device) must be connected
to a water softener which removes calcium and magnesium compounds from the water. The water softener
must be used in line with the manufacturer’s recommendations included in instruction manual.
If a water softener is not connected or is user and/or regenerated incorrectly, the dealer shall not recog-
nise any complaints related to repairs due to lime scale build-up in the device.
The following products are recommended to assure proper regeneration:
• Salt tablets, 25 kg bag - code: 231265
Water hardness
German degrees
(°dH)
French degrees
(°fH)
mmol/l Clark
degrees
Water softener
connection
over 24 over 40 over 4.2 over 28 Required
18 - 24 32 - 40 3.2 – 4.2 22 - 28 Required
12 - 18 19 – 32 2.1 – 3.2 13 - 22 Required
4 - 12 7 - 19 0.7 – 2.1 5 - 13 Required
under 4 under 7 under 0.7 under 5 Not required