Purolite Gelular Tannin Res

Purolite A850 is a gelular Type I strong base anion exchange resin built on an acrylic matrix, formulated to adsorb the soluble tannins that give drinking water unwanted color and taste. Supplied in a 1/2 cubic foot box, it is a targeted solution for surface and well waters affected by organic staining and off-flavors that come from decaying vegetation and natural organic matter.

How it works

The acrylic matrix is the key to this resin's performance: it excels at removing organic matter and, crucially, releases those organics again during regeneration. That reversible loading helps protect the bed from permanent organic fouling, a common failure mode for anion resins exposed to tannin-laden water. A850 also regenerates very efficiently, requiring lower levels of sodium hydroxide than a comparable polystyrene-based Type I resin, which translates into lower chemical use over the resin's life.

• Brand: Purolite (A850)
• Gelular Type I strong base anion resin, acrylic matrix
• Targets soluble tannins causing color and taste issues
• Reversible organic removal for strong fouling resistance
• Efficient caustic regeneration versus polystyrene Type I resins
• Volume: 0.5 CF box; weight approximately 28.4 lbs each

Despite its tannin focus, A850 retains a strong ability to remove weaker acids including carbonic acid and silica, comparable to standard Type I resins, which broadens its usefulness in demineralization-style applications. It is often deployed alongside a polystyrene-based resin, such as in a mixed bed positioned after an anion unit, where the combination removes a wider spectrum of organic compounds than either resin could achieve alone.

For water-treatment professionals tackling tannin color, taste, and general organic contamination, this Purolite gelular resin offers an efficient, fouling-resistant option that holds up well in challenging waters. Routine regeneration with caustic restores its adsorption capacity and keeps treated water clear and clean-tasting cycle after cycle. Correct bed sizing and contact time ensure the resin captures tannins effectively before breakthrough, making A850 a reliable choice for organics removal.

When designing a tannin system, pairing A850 with adequate contact time and a regular regeneration routine ensures the resin keeps pace with seasonal swings in organic loading, which can vary considerably in surface-fed supplies. For homeowners and installers battling tea-colored water and musty tastes, this Purolite gelular resin offers an efficient, fouling-resistant path to clear, pleasant drinking water.