You may not feel the impact but the president of CUPE Local 79, Tim Maguire said the city does as Toronto's inside workers prepare to ramp up their work-to-rule campaign.

"We think it's having an impact," Maguire said Friday on CBC Radio's Metro Morning.

About 20,000 nurses, cleaners, shelter staff and other inside city workers started the go-slow campaign Monday. 

Maguire declined to say what specific actions workers will take going forward, but emphasized they will try to keep public disruptions to a minimum:

"For child care, specifically, we're trying to make sure it doesn't have impact on the public ... They should not see any difference, but internally, we're making sure those workers in child care don't do some of the administrative duties they might have been asked to do," the union leader said.

"The supervisors will have to do those duties."

The warning of go-slow job action comes as the city's outside workers voted to ratify a four-year collective agreement with city officials.

The results of last night's CUPE Local 416 vote have not yet been released but the union said there was a large turnout and the majority were in favour of the deal. 

Maguire acknowledged that the outside workers' deal will put pressure on inside workers' union, but he said there are key differences between the two parties.

"Our membership is three-quarters women, thousands of youth we represent. We have four bargaining units, they have one bargaining unit. We represent three part-time units."

The union leader said the city and workers are still far apart on key issues and talks remain slow.

The sticking points in the negotiations include job security, stability and wages that aren't on par with other city workers.