A blue sign with the word phoslock on it

"A scientific approach to a growing fesh water challenge"

Restoration of impaired water bodies by the application of Phoslock

About Phoslock® Water Solutions

Phoslock Water Solutions (UK) Ltd and Phoslock Europe GmbH are wholly owned subsidiaries of Phoslock Environmental Technologies (PET) of Sydney, Australia.

PET is the manufacturer and intellectual property owner of Phoslock, a geo-engineered phosphorus-binding clay material developed by the Commonwealth Scientific Research Organisation (CSIRO) of Australia, in the nineties. ï»¿

The challenge: eutrophication, algae and algal blooms

Across lakes, reservoirs, rivers and managed water bodies, excess phosphorus inputs remain a key driver of eutrophication. Elevated nutrient concentrations can contribute to the development of algae and algal blooms, including harmful algal blooms (HABs), which present ongoing challenges for water managers, regulators and asset owners.


Phosphorus can enter aquatic systems from catchment sources such as wastewater discharges, agricultural runoff and urban drainage. Over time, accumulated phosphorus in bottom sediments may continue to cycle back into the water column, even after external inputs have been reduced. This internal phosphorus loading complicates long-term water quality management and increases the difficulty of meeting regulatory and operational objectives.



In response to these challenges, water authorities and site managers increasingly adopt integrated phosphorus management strategies that address both external and internal nutrient sources.

 A Nutrient Management Journey, Measure to Manage

Water is fundamental to life. It underpins human health, supports wildlife, and sustains the lakes, rivers and reservoirs that communities rely on every day. Increasingly, we are seeing discussions on social media, hearing concerns raised in the news, and feeling growing public awareness around changes in freshwater quality and how these changes affect the environments we value.


Across lakes, reservoirs, rivers and managed water bodies, excess phosphorus input remains a key driver of eutrophication. Elevated nutrient concentrations can contribute to the development of algae and algal blooms, including harmful algal blooms (HABs), and may be associated with declining water quality, challenges related to taste and odour, reduced water clarity, and increased pressures on aquatic systems. These issues present ongoing challenges for water managers, regulators and asset owners tasked with protecting and maintaining vital water resources.


Phosphorus enters aquatic systems from a range of catchment sources, including wastewater discharges, agricultural runoff and urban drainage. Over time, phosphorus can also accumulate in bottom sediments and continue to cycle back into the water column, even after external inputs have been reduced. This internal phosphorus loading adds complexity to long-term water quality management and can make it more difficult to achieve regulatory and operational objectives.


In response to these challenges, water authorities and site managers are increasingly focused on understanding phosphorus behaviour within water bodies and adopting integrated phosphorus management strategies that consider both external inputs and internal nutrient dynamics. Building this understanding is a key step in informed, evidence-based water quality management.

About Phoslock® Water Solutions

Phoslock Water Solutions (UK) Ltd and Phoslock Europe GmbH are wholly owned subsidiaries of Phoslock Environmental Technologies (PET) of Sydney, Australia.

PET is the manufacturer and intellectual property owner of Phoslock, a geo-engineered phosphorus-binding clay material developed by the Commonwealth Scientific Research Organisation (CSIRO) of Australia, in the nineties. ï»¿

"We seek to improve water quality across the globe."

Phoslock Water Solutions (UK) Ltd and Phoslock Europe GmbH are wholly owned subsidiaries of Phoslock Environmental Technologies (PET) of Sydney, Australia.

PET is the manufacturer and intellectual property owner of Phoslock, a geo-engineered phosphorus-binding clay material developed by the Commonwealth Scientific Research Organisation (CSIRO) of Australia, in the nineties. 

A yellow tractor is towing a boat in the water.

What is Phoslock?

Phoslock® was developed in Australia by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) as a phosphorus management technology for aquatic environments. It is a lanthanum-modified bentonite clay designed to bind free reactive phosphorus in the water column and at the sediment–water interface.


Lanthanum, a naturally occurring rare-earth element, has a strong chemical affinity for phosphate, forming an insoluble mineral that removes bioavailable phosphorus from circulation within the aquatic system.

A large body of water surrounded by trees and mountains on a sunny day.

Case Studies

Phoslock has been successfully applied to over 300 water bodies around the world.

Here you will find a selection of detailed case studies containing descriptions of the projects accompanied by images and videos.

A yellow tractor is towing a boat in the water.

What is Phoslock?

Phoslock was developed in Australia by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) to remove phosphates from water. The active element in Phoslock is lanthanum (a rare-earth element) which has a strong affinity to bind with phosphate. 

A large body of water surrounded by trees and mountains on a sunny day.

Case Studies

Phoslock has been successfully applied to over 300 water bodies around the world.

Here you will find a selection of detailed case studies containing descriptions of the projects accompanied by images and videos.

A yellow tractor is towing a boat in the water.

Useful documents & publications

A series of guidance and help sheets including a list of publications & links

A large body of water surrounded by trees and mountains on a sunny day.

Environmental Certifications

A seal that says tested and validated under industry standards

US and Canadian NSF/ANSI 60 Drinking Water certification

The logo for the chinese research academy of environmental sciences

Chinese Research Academy of Environmental Sciences (CRAES) Certification

A shelf full of binders with one that says ' a ' on it

Useful documents & publications

A series of guidance and help sheets including a list of publications & links

A wooden dock is sitting in the middle of a lake surrounded by trees.

Environmental Certifications

A seal that says tested and validated under industry standards

US and Canadian NSF/ANSI 60 Drinking Water certification

The logo for the chinese research academy of environmental sciences

Chinese Research Academy of Environmental Sciences (CRAES) Certification

A white background with a few lines on it

LATEST NEWS

Sun shining over a lake with reeds in the foreground, creating a warm, vibrant scene.

Phosphorus Under Control: From Persistent Pollutant to Manageable Parameter

by Damian Whelan • 11 February 2026
Excess phosphorus continues to challenge lakes and reservoirs across Europe. This article explores the science behind Phoslock®, its independently validated safety profile, and real-world results from major projects such as Rotterdam’s Kralingse Plas.
Two white bags, one with blue crisscross design, other with Phoslock product label.

Phoslock® manufacturing set to resume, strengthening supply for European projects

by Damian Whelan • 3 December 2025
Phoslock® confirms manufacturing will restart at the Changxing facility in early 2026 following refurbishment works. The decision supports future supply into Europe as inventories normalise and demand for phosphorus management solutions continues across lake and reservoir projects during 2026 programmes.
Man operating a blue and yellow aquatic weed harvester on a lake, spraying water.

Advancing Phosphorus Management in Freshwater Systems

by Damian Whelan • 30 November 2025
Aquatic Solutions UK has introduced a new tool to support precise placement of lanthanum-modified clay in freshwater projects. The system strengthens dose control, improves distribution, and helps teams deliver well-documented phosphorus-management work across a wide range of site conditions.
Show More News

We have carried out over 300 water treatment projects all over Europe and across the world

For more information about the Phoslock treatment or to start a conversation about treating your lake, reservoir or canal, please get in touch. Where appropriate, we will forward your request to a local licensed distributor.

A blue map of europe on a white background

We have carried out over 300 water treatment projects all over Europe and across the world

For more information about the Phoslock treatment or to start a conversation about treating your lake, reservoir or canal, please get in touch. Where appropriate, we will forward your request to a local licensed distributor.

A blue map of europe on a white background
A white background with a few lines on it