Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
  4.1 Softener specification
  4.2 Quality of materials and chemicals
      4.2.1 Cation exchange resin
      4.2.2 Regenerating salt
  4.3 Design and manufacturing specifications
      4.3.1 Resistance to hydrostatic pressure
      4.3.2 Resistance to cyclic pressure
      4.3.3 Minimum and maximum operating pressure
      4.3.4 Resistance to temperature
      4.3.5 Electrical safety
      4.3.6 Salt tank
      4.3.7 Continuity of supply during regeneration
      4.3.8 Protection against backflow and infiltration of brine
      4.3.9 Noise level
      4.3.10 Air vent
      4.3.11 End connections
      4.3.12 Drain connections
  4.4 Operating specifications
      4.4.1 Initiation of regeneration
      4.4.2 Brining efficiency
      4.4.3 Regeneration water
      4.4.4 Quality of treated water after regeneration
      4.4.5 Continuous flow rate
      4.4.6 Pressure drop
      4.4.7 Exchange capacity
  4.5 Installation specifications
      4.5.1 Connection to mains water supply and existing pipe network
      4.5.2 Drain
      4.5.3 Electrical connection
5 Labelling
  5.1 Identification of equipment
  5.2 Safety labelling
6 Technical documentation
7 Test methods
  7.1 Test conditions
      7.1.1 Ambient air
      7.1.2 Water and salt
      7.1.3 Test rig
      7.1.4 Analysis
  7.2 Cation exchange resin
  7.3 Technical documentation
  7.4 Manufacturing tests
      7.4.1 Resistance to hydrostatic pressure
      7.4.2 Resistance to cyclic pressure
      7.4.3 Continuity of water supply
      7.4.4 Protection against backflow
      7.4.5 Air displacement
  7.5 Operating characteristics
      7.5.1 General
      7.5.2 Nominal flow rate
      7.5.3 Regenerations
      7.5.4 Exchange capacity
      7.5.5 Brine efficiency
      7.5.6 Regeneration water
      7.5.7 Quality of treated water after a regeneration
Annex A (normative) Installation, operation and maintenance
Bibliography