The head of the country's largest trade unions is calling for a different approach to opposition to the water charge.
Organisers say they expect up to 100,000 people to turn out for around 80 demonstrations against the charge across the country tomorrow.
The Right2Water campaign is backed by unions including Mandate and UNITE, but SIPTU will not be taking part.
SIPTU General President Jack O'Connor says preventing the charge's introduction means the public would have to meet it through general tax - and would end up paying more.
"Preventing the introduction of charges doesn't actually mean what it says on the tin," he said.
"It doesn't mean we won't pay, it actually means we will pay more, at least twice as much more."