South West Water says ‘good progress’ being made against parasite

He said “rigorous cleaning processes” were in place to tackle the outbreak, including the installation of “additional protection measures such as specialised filters and ultra violet treatment.”

“In the meantime, we encourage people to continue to use water around their homes for washing, cleaning and flushing toilets,” Mr Harris said.

“The smaller pipes in customer homes compared with our network means that water moves through home plumbing at a much greater speed.”

The Incident Director said the water movement helped to clean household pipes, but it was important for customers to use boiled water for drinking and cleaning teeth.