Water Softening System - Bosch SRU53E05AU Repair Instructions

4.10

Water softening system

The water softening system (ion exchanger) is a container which
is filled with a fine-grained synthetic resin granulate. This synthetic
resin replaces calcium and magnesium ions in the water with sodium
ions situated on its surface.
Technical specifications:
Designation
Capacity:
Fine-grained salt
Coarse-grained salt
815_58300000120057_ara_en_d.doc – 25.05.11
Value Unit
approx. 1.3
kg
approx. 0.9
4.10.1 Water softening
The inlet water with its hardness constituents is conveyed via the
synthetic resin. Calcium and magnesium are bonded to the surface of
the exchange compound while sodium ions are released into the
water. When all sodium ions have been replaced with ions of the
hardness constituents (Fig.1), the capacity of the water softening
system is exhausted and it must be regenerated.
4.10.2 Regeneration
To make the ion exchanger functional again, a concentrated saline
solution (sodium chloride) is conveyed out of the salt dispenser
through the water softening system. On account of the large excess
the sodium ions force the calcium and magnesium ions out of the
saline solution and they attach themselves again to the exchange
compound (Fig. 2). The ion exchanger is now loaded and ready for
use again.
A Synthetic resin
Fig.1: Water softening Fig.2: Regeneration
Seite 18 von 60