10
2.8 Sodium Increase
Most of the sodium we consume on a daily basis comes from
food, specially processed food, since salt is an excellent pre-
servative and is used as an additive in prepared products.
Sodium consumption through the water we drink is rather low
when compared with that obtained from food.
In spite of this, it is very important to bear in mind, as mentio-
ned above, that water softeners increase the sodium concen-
tration present in treated water when compared to the con-
centration measured on the inlet.
WARNING: The maximum recommended sodium level in water for
human consumption is of 200 ppm. Depending on the sodium concen-
tration and the hardness of water to be treated, it is possible that softe-
ned water contains a higher concentration of sodium than recommended.
Should this be the case, or if water is to be consumed by persons who
must follow a low sodium diet, it is recommended to install a household
reverse osmosis system in order to be able to drink the water.
The table below can be used as a guideline to know the
increase on sodium concentration in treated water depending
on the inlet hardness:
INITIAL HARDNESS
IN WATER ºHF)
10
15
25
30
35
40
45
50
60
SODIUM ADDED BY THE SOFTE-
NER (mgNa/litre)
43
65
108
130
152
173
195
217
260
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