Eliminating cryptosporidium in water mains with Ice Pigging technology

August 2024

By partnering with SUEZ, the exclusive provider in the UK of Ice Pigging technology, South West Water successfully resolved cryptosporidium contamination in its water mains. This collaboration was crucial in addressing the contamination swiftly to protect public health.

South West Water detected a cryptosporidium outbreak in Devon and initially attempted to remove the contamination through intensive flushing and cleaning of the service reservoirs and mains. When these efforts proved insufficient, they turned to SUEZ’s specialised Ice Pigging technology. The mission was to swiftly address the contamination in the water mains.

Within 36 hours of being contacted, SUEZ mobilised and worked with South West Water’s response team to deploy Ice Pigging. This method uses a unique ice and liquid slurry to form a semi-solid plug that navigates complex pipe networks, effectively scouring sediment and contaminants from pipe walls. Initial operations successfully removed residual cryptosporidium, prompting an extension of the cleaning activity to the wider water supply zone.

Nearly 100 further Ice Pigging operations were planned within 48 hours, covering several thousand metres of pipework. Despite access challenges in remote locations, the flexibility of Ice Pigging allowed for efficient cleaning using smaller tankers.

The results were impressive, with SUEZ’s Ice Pigging technology proving highly effective in removing cryptosporidium contamination. This success was complemented by other measures implemented by South West Water, including mains replacement and the installation of microfilters and UV treatment systems. SUEZ’s Ice Pigging solution was chosen for its rapid deployment, proven effectiveness and adaptability to the unique challenges of the affected area.