UNSPSC 40161804: Filter aids

UNSPSC 40161804 Filter aids (Commodity) covers filtration media and treatment chemicals that state and local water systems use to treat drinking water and reclaimed water. Recent solicitations show water districts and municipal utilities buying microfiltration membranes, reverse osmosis membrane elements, silica dioxide sand for filtration, and treatment chemicals including sodium hydroxide, chlorine, aluminum sulfate, activated carbon, and polymers. The work ranges from pre-qualification of membrane suppliers for long-term recycling facility operations to spot purchases of consumable chemicals delivered on demand to treatment plants. Issuing bodies are primarily municipal water utilities and special-purpose water districts managing treatment infrastructure at the local level.

West Basin Municipal Water District in California dominates recent activity, with two separate opportunities posted in 2026 — one RFQ in June for submerged microfiltration membrane pre-qualification at the Edward C. Little Water Recycling Facility (response deadline May 26, 2026) and one RFQ in March for reverse osmosis membranes and spares at the Juanita Millender-McDonald Carson facility (response deadline February 26, 2026). The City of Griffin, Georgia issued an invitation to bid on May 28, 2026 for a fiscal year 2027 water treatment chemicals line-item contract covering 16 different chemical compounds with four one-year renewal options. The City of Phoenix Water Services Department solicited sealed bids (IFB-26-0161) on April 22, 2026 for a five-year silica dioxide contract with an estimated annual volume of 1 million pounds, delivery deadline February 3, 2026. California and Georgia show the strongest recent concentration of solicitations; membrane and chemical suppliers must meet NSF, AWWA, and ISO standards, and West Basin offers small and local business enterprise evaluation credits of up to 6 percent for qualified proposers.