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The council will start its "business as usual" recycling inspection on August 24 to remind people about the new rules around recycling.
Changes to the city’s recycling were introduced in July, but council waste and environmental solutions education and promotions officer Cath Gledhill said there was still some confusion.
Yellow-lidded bins are for rigid plastics 1, 2 and 5, tins, cans, aluminium and cardboard and paper.
Caps, lids, soft plastics, trigger sprays, polystyrene and milk or juice cartons are no longer accepted.
While soft plastic sleeve labels had to be removed from recyclable plastic bottles, adhered labels such as are found on milk bottles did not, she said.
"What we will be doing is reminding people about the changes and we’ll be doing it via feedback notices."
Inspections will run for eight weeks in random parts of the city.
Residents’ bins would be checked when they were put out for collection and be left with a coloured feedback form — either green, yellow, red or black.
A green notice meant they had recycled correctly and yellow showed there a few unwanted items.
Bins with these notices would be emptied.
"We like to say thank you because there are plenty of people who are doing a great job and are very conscious."
A red notice represented many unwanted items, and black was for bins with hazardous materials.
Ms Gledhill said some people were blatantly using the yellow-lidded bin for rubbish disposal.
"The level of contamination here is unacceptable."
The council would be taking a "hard line" on those people, and they would not be getting their bins emptied until they sorted it out.
"We will be going back to check.
"We may remove their bin and suspend their service for the yellow-lidded bin."