Sewage and water treatment tank workers in Durham have begun a week-long strike over pay.
GMB members at Premier Tech, in Peterlee, will down tools from Monday [10 July] to Friday [14 July] after a unanimous vote for industrial action.
Workers want £12.50 per hour, which amounts to a 12 per cent pay increase.
The company has only offered 7.9 per cent, with potential real terms pay cuts in subsequent years.
Andrew Blunt GMB Organiser, said:
"Premier Tech wants our members to accept a multi year deal – with two of those years all but guaranteeing a real terms pay cut.
“It’s completely unacceptable in the middle of a cost of living crisis.
“The company is happy to invest in the business but not the people who keep it running.
“If they want to avert ongoing industrial action, they need to have a rethink – and fast.”