In recent years, environmental awareness and global concern about water conservation and water pollution have accelerated the adoption of ZLD systems. The focus of ZLD is to reduce wastewater volume at lower costs and produce clean water suitable for reuse (e.g., irrigation). By reducing the load of thermal concentration, it is possible to lower operating costs. The PRO Series allows for an integrated line of ZLD systems.

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Model Type	Membrane Type	Size	Feature
PRO-XR1 (High Rejection RO)	RO	8-inch	Low fouling membrane with high fouling resistance. High salt rejection rate, providing high quality RO water in the first stage of ZLD systems. (Low-pressure membrane）
PRO-LF1 (Low Fouling High Pressure RO)	RO	8-inch	Low fouling membrane with high fouling resistance. This can be used in ZLD systems to filter heavily contaminated water (1-2% TDS) that has been concentrated in the previous stage. （High-pressure membrane)
PRO-XS1 (Extra Ion Selectivity NF)	NF	8-inch	NF membrane with selective separation capability, exclusively removing only divalent ions (e.g. SO₄2-) and allowing monovalent ions to permeate. This is commonly used in the back end of ZLD systems and can also be used to recover valuable materials.