SilicaSelect—Silica Removal System

Effectively remove silica from cooling tower blowdown, RO brine, and more

SilicaSelect removes silica from wastewaters such as RO brine or cooling tower blowdown. Use SilicaSelect to improve RO recovery, increase cooling tower water cycles, or treat oil & gas produced waters.

SilicaSelect: Silica Extractor

SilicaSelect is a smaller, simpler version of our automated BrineRefine treatment system. It removes silica and also de-saturates gypsum (calcium sulfate) as a positive side effect.


SilicaSelect is a standard size, skidded product, capable of treating 120 m3/day (22 GPM). Sound small? It’s meant to be. SilicaSelect is intended to treat side streams and enable incremental recovery improvements.

3D rendered image of a SilicaSelect skid showing pipework and reaction tank.
Photo of a filter press with precipitated, filtered solids underneath
A filter press produces solids precipitated by a chemical process

What SilicaSelect Can Do

If you have 600 m3/day of silica-saturated RO brine, one SilicaSelect skid helps you to boost recovery and lower brine volumes by 20%. That’s good enough in many cases to bring, say, an evaporation pond back into hydraulic balance. Don’t over-treat and over-pay when you can treat a side stream with SilicaSelect with minimized costs.


SilicaSelect removes silica through a high pH precipitation process, with solids filtered to 0.1 µm, making SilicaSelect RO water friendly. If gypsum is also super saturated (>2,550 mg/L), held in dissolved form with anti-scalants, then SilicaSelect will relieve the anti-scalants and remove gypsum, further enabling recovery gains. All solids emerge as a solid filter cake for ease of disposal.

Enhance a Project With SilicaSelect

SilicaSelect helps you to achieve water balance and cost savings by enhancing recovery and reuse. Use it to:

  • Bring an evaporation pond into balance,
  • Improve RO recovery to lower disposal costs.
  • Extract silica from cooling tower flows, which can increase the number of water cycles, reducing both make-up and blowdown water volumes.

For smart operation and compliance monitoring, combine SilicaSelect with our ScaleSense real-time sensor for silica measurement in the combined blended stream.


Contact us with your wastewater analysis, treatment goals, and flow rates to see if SilicaSelect is right for your project.

Photo of three cooling towers with steam emerging from the top of them


Boost RO Recovery With a Side Stream Process

SilicaSelect can remove silica and calcium sulfate in a side stream, reducing silica in the RO feed and increasing RO recovery with minimal, cost-effective intervention. This treats to the right level with a minimal treatment load & optimized blending. Let us help with an energy and mass balance for your system and a design that peak-shaves silica from RO brine prior to recycling.


Learn more about boosting RO recovery

Achieve Incremental RO Recovery

SilicaSelect can trim silica levels prior to a secondary RO, enabling your next increment in recovery improvements and producing less brine waste in a cost-effective manner. Seeking a higher recovery solution? We can help you with that too, as well as generate a comparative analysis for your decision making. 


Learn more about why maximizing RO recovery matters


Increase Cooling Tower Cycles

SilicaSelect can facilitate cooling tower optimization: managing risk, lowering freshwater consumption, and reducing blowdown. 


Learn more about increasing cooling tower performance

Related Resources

Photo of steam coming from several cooling towers that produce blowdown wastewater

Achieving 70x Cooling Tower Blowdown Volume Reduction

Cooling towers are used by industrial plants to reject waste heat to atmosphere. A portion of the cooling water is blown down after a number of cycles of concentration, before the ions and metals reach their scaling limits. This blowdown requires management.

Photo of wastewater entering a coal ash pond

Coal Ash Pond Water Treatment: Technology Options

Coal ash pond water may require treatment because leached pollutants from ash pond water pose human health and ecological risks. Consider membrane concentrators, minimal liquid discharge (MLD), and zero liquid discharge (ZLD) technologies to reduce brine volumes from treating leachable pollutants.

Photo of a ScaleSense real-time sensor/analyzer for scaling ions

Real-Time Sensing and Process Control: Introducing ScaleSense

Real-time measurement provides prompt feedback for controls. A real-time sensor can help to optimize your process, reduce risk, and minimize operational and maintenance demand. Saltworks has developed a new real-time sensor—that is simple and robust—to operate in the high-TDS range.