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We have been producing water purifying filters for 29 years and selling them in more than 60 countries

Dowex™ HCR-S/S strong acid cation exchange resin 25 L

Article : HCRSS
  • Soft water in each tap  ?
  • Household appliances without scale, and plumbing without white streaks  ?
  • Durable solution for hard water  ?
  • Low cost water treatment  ?
VAT NOT included

Dowex HCR-S/S is a strong acid cation exchange resin of gel type developed by Dow Chemical Corporation (USA) for application in domestic, commercial and industrial water softening systems.

The resin features high exchange capacity to provide excellent kinetic behavior. It exhibits good physical, chemical  and thermal stability.

Key advantages

  • effective reduction of hardness due to high exchange capacity

  • high filter performance due to high filtration rate

  • economical water consumption for regeneration due to low bulk density

  • economical salt intake

  • stable effective operation for more than 5 years

During the water filtration through the cation exchange resin the hardness ions Ca2+ and Mg2+ are replaced by Na+ ions.

The replacement of calcium and magnesium ions by sodium ion prevents scale formation on the heating surfaces of boilers and heat exchangers. As water passes through the cation exchange resin, a number of sodium ions able to perform the exchange decreases, and a number of calcium and magnesium ions retained on the resin grows, so the cation exchange resin is being exhausted. That is why it should be regenerated by passing the solution of sodium chloride through the cation exchange layer, which will result in restoration of the resin’s exchange capability.

During the regeneration, calcium and magnesium ions are flushed into the drain, and the cation exchange resin is saturated with sodium ions from the brine solution.

Technical characteristics of the media




Functional group

Dowex® HCR-S/S

Strong acid cation

Styrene-DVB, gel

Sulfonic acid



Ionic form during delivery


Total exchange capacity, eq/L (min.)


Moisture content, %


Number of uncracked beads, % (min.)


Beads density, g/mL


Bulk weight, g/L


Recommended operational conditions

  • Maximum operating temperature: 120 °C

  • pH range: 0...14

  • Bed depth, min.: 800 mm

  • Flow rates:

Service/fast rinse: 5...50 m/h

Co-current regeneration/displacement rinse: 1...10 m/h

  • Total rinse water consumption: 3 - 6 bed volumes

  • Regenerant: 8...12% NaCl

  • Salt consumption for regeneration: 100...150 g/L