While it may be tempting, tipping or pushing certain items down the drain is doing your sink more harm than you know.
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Here are five items you should never dispose of down the drain.

Egg shells
The sharp, hard edges associated with the shell of an egg can get caught with other items going down the drain, eventually causing it to clog. Instead, here are eight ways to recycle your shells.
Grease
Grease and oil stick to the pipes. After pouring these substances down your drain they become solid, catching any stray food scraps that come past eventually causing a blockage. Instead, drain the oil into another food wrapper in the bin (for example, chip packets or bread bags).
Flour
When flour and water are mixed together, they can turn into a glue-like substance. After coating the edges of your drain, it can collect other bits of garbage and food scraps.
Fruit stickers
When washing fruit, make sure you take the stickers off. Stray stickers don’t disintegrate in water and could cause problems in the future.
Coffee grounds
Coffee grounds are a common cause of blocked drains. As this plumbing website points out, “Nothing causes more blockages and clogged pipes than coffee grounds and grease.” Always dispose of them in the bin or compost.
Products claiming to be ‘flushable’
It turns out those flushable wipes can’t actually be put down the drain. In an article published on choice.com.au last year, it was reported that Australia’s water service providers are spending around $15 million a year to clear blockages.