Greywater Recycling System segmentation by type distinguishes three primary technologies: membrane filtration, biological treatment, and physical treatment. Membrane filtration, which includes ultrafiltration and reverse‑osmosis modules, captures fine suspended solids and pathogens, accounting for roughly 38 % of total market revenue due to its high removal efficiency and suitability for high‑density urban installations. Biological treatment systems—such as constructed wetlands, aerobic bioreactors, and bio‑filtration units—leverage microbial degradation to lower biochemical oxygen demand; they represent about 34 % of the market, driven by lower capital outlay and preference in retrofit projects. Physical treatment covers sedimentation, sand‑filter, and UV disinfection units, contributing the remaining 28 % of sales. The relative share of each subtype reflects divergent cost structures, regulatory acceptance, and performance criteria across geographic regions, thereby shaping the overall market size and growth trajectory. In regions with stringent water‑reuse mandates, membrane solutions capture a larger proportion, whereas emerging economies favor biological units because of lower operational costs. Moreover, ongoing R&D in nanofiltration membranes and hybrid configurations is expected to shift the subtype distribution, potentially expanding the membrane segment’s share beyond its current level.
