Water Softener
Weichwassermeister
®
GSX 5, GSX 10, GSX 10-I
Order no.-Nr. 075 187 970-inter Edited by: KONS-nkes-mrie G:\BA-187970-INTER_GSX 5-10.DOC
30
Note:
When softening drinking water, the stipulations of the German
Drinking Water Ordinance are compulsory! Max. sodium concentration:
200 mg/l.
Sodium concentration
Your local waterworks will inform you about the sodium concentration of
the raw water. When softening the water by 1 °dH (1,8 °f, 0,18 mmol/l),
the sodium concentration increases by approx. 8.2 mg/l. If the require-
ments of the German Drinking Water Ordinance must be observed, the
water cannot be softened indefinitely. The permissible blending hardness
results from the limit value for the sodium concentration and the raw wa-
ter hardness.
200
mg/l (limit value acc. to Ger. Drinking Water Regulations)
– x mg/l (sodium concentration in raw water)
y
mg/l (permissible dosing of sodium during softening)
y
8 2
,
= Z °dH (max. possible softening)
The raw water may be softened by up to a maximum of Z °dH. Depend-
ing on the sodium concentration of the raw water, a blending hardness
must be chosen which is lower than the maximum value of 200 mg/l.
Example for the softening of drinking water
Raw water (28 °dH, 50 °f, 5,0 mmol/l) contains sodium (10.5 mg/l).
Permissible dosing of sodium during softening:
200 mg/l – 10,5 mg/l = 189,5 mg/l
This means that the maximum permissible softening is:
mmol/l)
4,1
f,
(41
dH
23
8,2
189,5
28 – 23 = 5°dH (9 °f, 0,9 mmol/l)
Thus, blending should not be set to a value which is lower than 5°dH (9
°f, 0,9 mmol/l).
3.1 Recommended soft
water hardness
3°dH:
5,3 °f:
0,53 mmol/l
Minimum value according to DIN 12502 Corrosion Pro-
tection.
Ideal soft water (highest comfort).
4-6°dH:
7,1-10,7 °f
0,71-1,07 mmol/l
Ideal soft water (highest comfort).
