The redevelopment, which will also include an extension to the site, will allow its Aqua Pura natural mineral water brand to grow its share of the UK bottled water market.
Ruth Simpson, corporate relations director at Princes, said: “This strategic investment consolidates Princes’ position as one of the UK’s leading soft drinks suppliers and reflects the strength and scale of the bottled water market.
“We are committed to ensuring our sites have the capacity and technological capabilities to not only meet customer needs now but also provide a platform for long-term future growth.”
Work has already begun on the project, which will include a new bottling line and construction of an office block to house a new laboratory, engineering workshop, staff canteen and welfare facilities.
Four new engineering jobs will be created at the site, which already employs 130 people.
The Eden Valley redevelopment follows last week’s announcement of a £3.6 million investment in its Long Sutton site, which will include a new on-site restaurant to cater for the site’s 660 employees.