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Recommendations for water treatment

A water analysis in advance helps to determine the possible uses and limits for the specific application. In order to create the optimal conditions for efficient and low-maintenance air humidification, water treatment is recommended in certain cases.

Operation with drinking water

Operation with drinking water

Attention: Observe water quality

D1: Range below the operating limit
C1: Range of low conductivity
A:    Range of normal conductivity
B:    Range of increased conductivity
C2: Range of high conductivity
D2: Range above the operating limit

Operation with demineralised water

Reverse osmosis process

  • Desalination rate of 96 - 98 % and removal of almost all minerals and contaminants
  • Less maintenance and higher operational availability
  • Hygienically flawless - prerequisite for adiabatic humidification
  • Total hardness drops to 0 °dH; conductivity also drops sharply
  • Residual conductivity of 3 μS/cm recommended to protect against excessive corrosion
  • An optional blending device enables the provision of optimised feed water for electrode steam humidifiers

Permeate output losses with decreasing feed water temperature

Planning information for osmosis systems

Expansion tanks are used as storage tanks and reduce the risk of pressure surges in the water pipes.

Rule of thumb for the expansion tank

The gross volume of the expansion tank (air content + water content) corresponds to approx. three times the net volume (buffer quantity or water content).

Rule of thumb conductance

approx. 35 times total hardness at 20 °C [µS/cm = 35 * ° dH]

  • Osmosis systems with a lower capacity (up to 100 l/h) can usually be supplied with water up to 20 ° dH.
  • For osmosis systems with higher capacities, softening or anti-scalant dosing is recommended.
  • Do not forget the water analysis!

Operation with fully softened water

Water softening process

  • Exchanges calcium and magnesium ions for sodium ions
  • Produces water with 0° dH
  • Less maintenance
  • Higher operational availability
  • Salts remain contained
  • Conductivity remains or increases
  • Danger with soft water: foaming