Cation Resin Overview

Urbans Aqua stocks Purolite, Thermax & ResinTech cation resin for quick shipment.


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Purolite Cation ResinThermax Cation ResinResinTech Cation Resin

Cation resin is a negatively charged matrix with exchangeable positive ions (cations). Negatively charged ions are fixed and permanently attached – part of the resin structure. Because the bead is negatively charged only positive ions are attracted or exchanged. For water treatment purposes the cation resin is sold in the sodium form (Na+) or hydrogen form (H+).

Visit our PDF Library for technical specifications and product manuals on cation resins.

Visit our SDS Library for safety data sheets on cation resins.

Cation Resin Applications

Water Softeners – Hardness Reduction

Strong base cation resin in the sodium (Na+) is commonly used for household, commercial and industrial water softening applications. According to the Water Quality Association, the hardness of water supplies in the United States ranges from 1 to 350 grains (gpg) per gallon or 17.1 to 5,985 ppm.   However, most waters range between 3 and 50 gpg.   USGS Water Quality Information

Softening with cation resin is a simple exchange function. The resin bead is negatively charged and attracts positive ions. When supplied in the sodium form (Na+) the resin will exchange sodium ions for hardness ions – calcium and magnesium. The bead is more strongly attracted to these ions and readily exchanges with the sodium. Once the resin is exhausted it is regenerated with a brine solution (NaCl). The brine overwhelms and releases the calcium and magnesium from the bead. The resin is converted back to the sodium form and ready for re-use.

Urbans Aqua stocks:

Water Softeners – Iron & Manganese Removal

The hard water problem is often compounded by contaminants like iron (rust stains) and manganese (black stains). Iron water has a distinctive taste.





Strong Acid Cation in the hydrogen form (H+) in combination with strong base anion (SBA) in the hydroxide form (OH), is most often used for demineralization processes such as portable exchange tank (PEDI) operations. In this case, the hydrogen is exchanged for calcium, magnesium and sodium. (For more information please refer to section on demineralization for portable DI exchange operations.)

Links to Specifications & Engineering Bulletins:

Resin Cation Engineering Bulletin C100 H Cycle

Resin Cation Engineering Bulletin C100 Sodium Cycle

Resin Cation Engineering Bulletin C100 Sulfuric Acid Regen 08 2013

Resin Cation Overview Brochure Shallow Shell SSTC60

Resin Thermax Tulsion T-42 Na BC N

Resin Thermax Tulsion T-42 Na N

Resin Thermax Tulsion T-52 Na BC N

Resin Thermax Tulsion T-52 Na N

Resin Thermax Tulsion T-240 Na N

Resin Purolite SAC C100E Gel

Resin Purolite SAC C100 Gel Na

Urbans Aqua is a stocking wholesaler of Residential & Commercial Water Treatment Equipment and supplies including Ion Exchange Resin; Calgon & Jacobi Activated Carbon; Filterag Plus; GreensandPlus; Pyrolox Advantage; KDF; Birm; Sand/Gravel; Clack, Fleck & AqMatic valves; Stenner Pumps & Parts. 

We work exclusively with water treatment dealers.