PWNT unveils the next generation of SIX®

Why SIX®?

SIX® was developed by PWNT to remove dissolved contaminants early in the treatment process, improving downstream performance and helping utilities address increasingly complex water quality challenges. The technology effectively removes natural organic matter (NOM), dissolved organic carbon (DOC), sulphates, nitrates, phosphates and, depending on the resin selected, PFAS and other emerging contaminants.

Today, SIX® is successfully applied to full-scale drinking water facilities in Europe, with pilots supporting adoption in additional markets around the world.

Three key innovations

The next generation of SIX® introduces three major engineering improvements focused on resin regeneration and distribution. These innovations reduce footprint, simplify operation, and lower both capital and operating costs, while maintaining the proven treatment performance of SIX®.

A simplified process layout

The fresh resin vessel has been eliminated, while settling and storage functions have been integrated into the hopper and regeneration vessels. This significantly simplifies the process layout and removes the need for the regeneration column that previously required deep excavation works.

More efficient resin distribution

A direct ejector feed system now replaces stirred resin storage, enabling more stable resin dosing while reducing energy consumption. Depending on operating conditions, power consumption for this part of the process can be reduced by 6-12%.

Semi-continuous regeneration

Regeneration has evolved from a batch-based operation to a semi-continuous process with fully integrated resin handling. This gentler approach reduces mechanical stress on equipment and lowers resin valve cycles from five to seven operations per regeneration cycle to just one, contributing to improved reliability and longer equipment life.

"The second generation of SIX® is designed to respond to increasing pressure on water quality and space in urban environments. It improves efficiency and footprint without trade-offs on water quality. "

Clement Pierart

Chief Executive Officer of PWNT

Discover the Next Generation of SIX®

The full story behind the next generation of SIX® is explained in our dedicated introduction video, first premiered during Singapore International Water Week 2026.