ExcellPureRO™ High Silica Rejection RO Membranes
Reverse Osmosis Optimized for Silica and Boron Rejection
ExcellPureRO membranes use RO chemistry designed for exceptionally high silica and boron rejection.
SnowPure’s ExcellPureRO™ membranes use high-performance RO membrane chemistry selected for high rejection of soluble silica and boron, making them well suited for demanding ultrapure water applications.
Typical commercial reverse osmosis (RO) membranes are designed for general desalination and are not optimized for silica (SiO₂) and boron rejection. ExcellPureRO™ membranes are specifically engineered to address this limitation.
Designed for Low-Silica RO Permeate
Achieving very low silica levels in RO permeate is critical for many downstream processes, particularly:
- Electrodeionization (EDI) feedwater
- Ultrapure water systems for low Boron semiconductor use
- High-pressure boiler and power applications
SnowPure ExcellPureRO™ (SXR™) membrane elements are specifically designed for high silica and boron rejection, helping reduce silica loading to downstream EDI systems and mixed-bed polishers. These membranes have been matched and validated with SnowPure Electropure™ EDI modules to provide a fully optimized RO-EDI solution.
High Silica Rejection RO Membrane Elements
Available Sizes: 2.5″, 4″, and 8″
Silica concentrations in raw water vary significantly by source:
- Surface waters: typically 4–8 ppm SiO₂
- Volcanic regions (e.g., Japan, Mexico): 20–100 ppm SiO₂
- Groundwater in parts of the Middle East: often elevated silica levels
High silica concentrations present challenges in RO systems due to limited rejection by standard membranes and the risk of silica scaling.
Conventional standard and low-energy (LE) RO membranes typically achieve only 97–98% silica rejection, which can be insufficient for high-purity applications.
ExcellPureRO membranes use RO chemistry designed for exceptionally high silica and boron rejection, engineered to achieve >99.2% rejection of soluble silica, significantly reducing permeate silica concentration.
Silica Scaling Control and System Design Support
To support stable operation at high silica concentrations, SnowPure recommends using AWC Pureflux® Si antiscalant in conjunction with ExcellPureRO™ membranes. When properly applied, Pureflux® Si enables:
- RO concentrate silica levels up to 400–600 ppm SiO₂
- Reduced risk of silica fouling and scaling
- Improved membrane life and system reliability
SnowPure provides RO system projections and antiscalant projections to support proper design and operating limits for high-silica feedwaters.
