Alkaline RO membrane cleaner segmentation by application distinguishes four principal end‑use domains that collectively drive market revenue. Desalination accounts for the largest share, roughly 40 % of total sales, because large‑scale seawater plants rely on frequent membrane conditioning to sustain permeate flux and limit scaling. Water‑reuse facilities, contributing about 30 %, employ cleaners to recover membranes exposed to high organic loads from reclaimed wastewater streams. Industrial process water—including petrochemical, food‑and‑beverage, and power‑generation circuits—captures roughly 20 % of the market, reflecting the need for customized cleaning protocols that address specific foulants such as hydrocarbons or heavy metals. The remaining 10 % originates from municipal water‑treatment plants, where lower pressure RO units operate under moderate fouling pressures but still require periodic alkaline cleaning to maintain compliance. Investment in advanced monitoring systems further amplifies cleaning frequency in desalination, reinforcing its dominant share.