What is the difference between desalinated water, pure water and soft water?

1. desalinated water

Desalted water is water that removes or reduces the strong electrolyte contained in it to a certain extent, which is easy to remove. The remaining salt content in the desalinated water should be between 1 and 5 mg/L.

The method of preparing desalinated water:

  • Distillation method, heating and evaporating salty water, and condensing the steam to obtain desalinated water. Distillation is mostly used in laboratories to wash containers or prepare solutions, and is suitable for places with small amounts and high purity requirements.
  • Ion exchange method, the salty water passes through an exchange column filled with zeolite or ion exchanger (see ion exchange), calcium and magnesium ions remain on the exchange column, and the filtered water is desalinated water;
  • Electrodialysis method By virtue of the selective permeability of ion exchange membranes to ions, under the action of an external electric field, the cations and anions in the water between the two ion exchange membranes are concentrated to the anode and anode through the exchange membrane. So the area between the membranes becomes a fresh water area, and the outside of the membrane is a concentrated water area. The water drawn from the fresh water area is desalinated water.

Ion exchange method and electrodialysis method are mostly used in chemical industry, such as boiler water can reduce scaling and corrosion, and is suitable for places with large quantities and low purity requirements.

2. Pure water

Pure water, also known as deionized water, refers to the seal made by electrodialysis method, ion exchanger method, reverse osmosis method, distillation method and other appropriate processing methods using water that meets the sanitary standards of drinking water as raw water. It is a colorless and transparent water that can be directly drinkable in a container without any additives. It can also be called pure (chemically). It is used more in experiments and is made by distillation and other methods. Distilled water

1. The principle of pure water equipment

Using pretreatment, reverse osmosis technology, mixed bed, EDI device and post-treatment methods, the conductive medium in the water is almost completely removed, and the non-dissociated colloidal substances, gases and organic substances in the water are removed to a very low degree of water treatment equipment

2. Features of pure water equipment

  • Large water permeability and high desalination rate. Under normal circumstances ≥98%
  • It has a high retention and removal effect on organic matter, colloids, particles, bacteria, viruses, heat sources, etc.
  • Low energy consumption, high water utilization rate, and lower operating costs than other desalination equipment.
  • There is no phase change in the separation process, which is reliable and stable.
  • The equipment has small size, simple operation, easy maintenance, strong adaptability and long service life.

3. soft water

Soft water refers to water whose hardness is lower than 8 degrees. Soft water contains less soluble calcium, magnesium and other compounds. In natural water, rain and snow are soft water. Spring, stream, and river water are temporarily hard water, part of the groundwater is hard water, and distilled water is artificially processed soft water.

Soft water can make soapy water more foamy, because unlike hard water, soap molecules in soft water are not easy to discard sodium ions and combine with calcium and magnesium ions, so the cleaning effect can be achieved with less soap. It can also make hair softer and better organized, and taking a shower with soft water can also make people more comfortable.

1. Principle of water softening equipment

Using the principle of ion exchange to remove calcium, magnesium and other scaled ions in water. When the raw water containing hardness ions passes through the resin layer in the exchanger, the calcium and magnesium ions in the water will be replaced with the sodium ions adsorbed by the resin. The resin adsorbs the calcium and magnesium ions and the sodium ions enter the water, thus flowing out of the exchanger. Water is softened water with hardness removed.

2. Features of water softening equipment

  • Automation of water softening process: The water softening equipment realizes the automation of ion exchange and resin regeneration process through the program control device.
  • High efficiency: The water softener is designed reasonably, so that the resin’s effective working exchange capacity can be fully utilized.
  • labor saving: no need for special operation, easy installation.
  • non-toxic: the valve body is lead-free brass or engineering plastics.
  • water saving: water production rate is above 98%.
  • Power saving: Due to the siphon principle, no salt pump is needed for regeneration.
  • easy to adjust: the regeneration cycle and time can be adjusted as needed.
  • tank body anti-corrosion: the tank body is made of stainless steel, glass fiber reinforced plastic, steel lining plastic material to avoid resin pollution.
  • wide applicability: can be used in industrial boilers, heat exchangers, air conditioners, laundry, bathing equipment and food, pharmaceuticals, electronics and other industries.

Deionized water is commonly known as desalinated water, also known as pure water, or deep desalinated water. Generally, it refers to water that removes the strong conductive substances that are easily removed in water and removes weak electrolytes such as silicic acid and carbon dioxide that are difficult to remove in the water to a certain extent. Compared with hard water, soft water has a lower degree of desalination than pure water.


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