HUNTER Water is reminding locals to only ever flush the three Ps - pee, poo and (toilet) paper.
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There are concerns that in the wake of the panic buying of toilet paper prompted by the caronavirus that locals who run out of the stuff may revert to using other products in the toilet.
But Hunter Water warns that products such as paper towel, tissues and wet wipes do not break down properly and can contribute to large blockages in the wastewater system.
"Not only are sewer blockages disgusting and unpleasant for our crews to remove, they are also expensive," Hunter Water's acting executive manager of service delivery for customers, Glen Robinson, said.
"It was only recently in late 2019 that we had to remove a 14-tonne blockage from our wastewater treatment plant at Morpeth. The operation required specialist equipment and took several days to complete.
"We are now preparing to remove yet another one from the same plant.
"Sewer blockages can also cause overflows into the environment and our waterways, as well as in people's homes, leading to costly plumbing bills for the homeowner."
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Central Coast Council has previously issued similar reminders to its residents, noting that even wipes labelled as "flushable" should not be sent down the s-bend.
"This is a timely reminder to all of our customers across the Lower Hunter that only the 'Three Ps' should be flushed down the toilet - pee, poo and toilet paper," Mr Robinson said.
Hunter Water also allayed any concerns about its water supplies, saying the area's drinking water remained safe to drink.
"There is no evidence that drinking water will be affected by coronavirus or that it is transmitted by drinking water," Hunter Water said in a statement.
"There is no need to buy bottled water for drinking. Safe, clean tap water will continue to be supplied directly to your home every day."
Meanwhile, Coles has stepped up efforts to ensure its customers can buy toilet paper.
The supermarket had implemented a four-pack limit per customer, but found that all toilet paper was still being purchased within an hour of hitting the shelves.
"We have therefore made the decision to change the limit to one pack per customer so that toilet paper is available for more of our customers, particularly the elderly and people who are unable to purchase in large volumes," Coles CEO Steven Cain said.
A Woolworths spokesman said the company had put a two-pack limit in place for customers.
The supermarket encouraged shoppers to purchase only what they needed.