Question 1

What is the difference between UF and RO?

Accepted Answer

UF removes particulate, colloids and microorganisms but leaves dissolved salts in place. RO removes dissolved salts as well. If your problem is turbidity or bacteria, UF is the correct and cheaper answer; if it is TDS, you need RO.

Question 2

Can UF replace chlorination?

Accepted Answer

UF is a physical barrier to bacteria, but stored treated water can be recontaminated. A disinfection residual is normally still required where water is stored or distributed.

Question 3

Is UF worth installing before an RO plant?

Accepted Answer

On variable surface water, usually yes. It stabilises the silt density index reaching the RO membranes, which extends membrane life and reduces cleaning frequency.