Softener Filter

The water treatment process is basically divided into three parts: pretreatment system, deep treatment system and terminal treatment system. Generally, pretreatment includes multi-media filters, activated carbon filter, softener, iron and manganese removal filter, ultra-filtration, micro-filtration.,etc. Deep treatment includes membrane treatment and ion exchange. Terminal treatment covers ozone, UV, etc.

Brief Introduction

Natural water contains various salts, which dissolve in water to form ionic substances. That is, anions and cations. Ionic substances in water will combine into water-insoluble substances during heating or contact with other solutes (such as detergents). Generally, calcium and magnesium plasma in water will form scale, which will bring many inconvenience and harm to production and daily life.

In order to prevent the RO concentrated water end, especially the concentrated water side of the last membrane element of the pressure vessel from forming a scale layer on the membrane surface due to insoluble salts, thus damaging the due performance of the membrane element, a softener is designed in the system.



  • High accuracy
  • High productive
  • Easy to operate
  • Long warranty
  • Long service life
Working Principle
Working Process

Working Principle

Cation exchange resin is filled in the softener, and it is regenerated by running in the downstream and countercurrent. When the filtered water enters the softener, Ca2+and Mg2+ions in the water will exchange with the cation exchange resin, and calcium and magnesium ions will be adsorbed on the exchange group.

When the softened resin fails, a certain concentration of salt solution is used to pass through the failed cation resin layer from top to bottom to restore the working capacity of the failed resin.

Working Process

Product Water

Untreated raw water flows through the resin layer from top to bottom, and ion exchange reaction takes place to produce softened water, which is discharged from the soft nozzle.

Back Wash

After the resin fails, it needs to backwash first. Raw water flows through the resin layer from bottom to top, and backwash sewage is discharged from the drain outlet. The backwashing process can remove the suspended solids trapped in the resin layer, destroy the resin hardening, and loosen the resin so that the regenerated salt solution can be evenly distributed in the resin layer.


The saturated salt water in the salt tank is sucked into the raw water runoff by the salt suction valve to form the regenerated salt solution. Regenerated salt solution flows through the resin layer from bottom to top, that is, the exchange saturated resin is regenerated in the downstream, and the regenerated waste liquid is discharged from the drain outlet.


The raw water flows through the resin layer from top to bottom, so that the water can wash away the surplus salt liquid remaining in the regeneration, and the flushing sewage is discharged from the drain outlet.

Water Flooding

Inject water into the dissolved salt tank to dissolve salt crystals and form new saturated salt water for reuse next time.

Resin Replacement

If the regeneration frequency of the softener is too high or the hardness of the effluent cannot meet the requirements after regeneration, the softened resin has failed, and the softened resin needs to be replaced. The failure period of softened resin varies according to the hardness of raw water and the use frequency of softener, generally 2-3 years.


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