The types segment classifies chemicals by functional role: antiscalants, cleaning agents, corrosion inhibitors, biocides, and pH adjusters. Antiscalants are further split into inorganic (e.g., phosphate‑based) and organic (e.g., polymeric) variants, each targeting specific scale‑forming species. Cleaning agents comprise acid cleaners for carbonate removal and alkaline cleaners for organic fouling, reflecting distinct process chemistries. Corrosion inhibitors, often nitrogen‑based, protect membrane housings and piping from aggressive feed water. Biocides, categorized as oxidizing (e.g., chlorine) or non‑oxidizing (e.g., quaternary ammonium compounds), control microbial growth that can impair membrane performance. pH adjusters, including acids and bases, maintain optimal operating conditions to enhance chemical efficacy. By quantifying the relative spend on each type, analysts can assess how functional requirements shape the market’s composition and forecast shifts driven by emerging membrane technologies or regulatory changes.