Ultrafiltration uses hollow-fibre membranes with pore sizes of ~0.01 microns to physically remove turbidity, suspended solids, bacteria, viruses and protozoa — without chemicals, without coagulant dosing, and without the variable performance that conventional clarification suffers as feed water shifts.
Conventional water clarification depends on coagulation, flocculation and settling — a process that works well when feed water is consistent and badly when it isn't. Monsoon turbidity, algal blooms, intake pump fluctuations: all of these expose the limits of chemical clarification.
UF replaces variability with certainty. Hollow-fibre membranes physically reject everything larger than ~0.01 microns — a class that includes essentially all suspended solids, bacteria and viruses — regardless of feed water condition. The output is consistent within tight bounds: SDI < 3, NTU < 0.1, no detectable bacteria.
That consistency is exactly what downstream RO membranes need. A protected RO membrane runs for 5+ years with predictable cleaning frequency. An unprotected one fouls in 18 months. UF is the most cost-effective insurance policy money can buy on an industrial water system.
Canal, river, dam or pond intake — UF removes turbidity, suspended solids, bacteria and protozoa to a consistent SDI < 3 for downstream use, even through monsoon variability.
For source water with high SDI / TSS or biological fouling — UF protects RO membranes, extends life, and dramatically reduces CIP frequency and chemical consumption.
For treated wastewater being reused for non-contact applications — cooling tower make-up, gardening, flushing, dust suppression — UF gives bacteria-free output without chlorine residuals.
For townships, hotels, hospitals and industrial colonies drawing on surface water — UF replaces traditional clarification with predictable performance.
Where source water has SDI > 5, biological load, or seasonal turbidity — UF protects expensive RO membranes downstream.
For closed-loop systems polishing biologically treated wastewater back to reuse-grade for cooling, flushing or process use.