pre-treatment RO

Reverse osmosis is the technology to remove dissolved matter from water. However it is not build to remove suspended solids and microbiology. With highly efficient ultrafiltration technology as pretreatment, Pentair brings RO membrane technology to perfection.




  • Efficient ultrafiltration membranes
  • Low energy consumption
  • Low chemical consumption
  • High system recovery
  • Ultrafiltration pretreatment can be applied in vertical or horizontal dead-end configuration

application areas

Reverse osmosis (RO) is applied in a growing number of industries to prepare process water, with seawater, groundwater, or even wastewater as the source. Proper pretreatment is indispensable to protect the RO membranes. They cannot cope with suspended solids or microbiology, as they cannot be backwashed or sterilized. 

The ultrafiltration (UF) technologies are capable to treat the water to a quality suitable as RO feed. All suspended solids and microbiology has been removed when UF is applied.

The success of reverse osmosis membrane technology started with intensive research efforts about 50 years ago. Today this technology is used in nearly every application that aims for high-purity water, and RO has made seawater desalination economically viable. Other typical users of RO membranes are in industrial wastewater decontamination and in the preparation of drinking water from almost any source. UF offers the possiblity to treat challenging waters that could not have been treated with conventional pretreatment.

pentair solutions

Pentair is market leader in the field of RO pretreatment. Our ultrafiltration (UF) membranes retain suspended solids and microbiology in the most efficient manner at the biggest RO installations worldwide. Whether used for treating seawater, groundwater, or wastewater to produce process water, the pretreatment must meet high standards to protect the RO membranes. 

RO pretreatment with Pentair UF technology is applied in vertical and horizontal dead-end configurations.

Our engineered and pre-engineered solutions for RO pretreatment depend on feedwater quality and include a large number of solutions based on UF membranes and cartridge filters. Pentair has helped to build many of the world’s largest desalination and industrial water treatment plants. Our experience results in significant efficiency gains. 

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