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The sponges that are commonly bought in shops are synthetic. These are made from polyester foam that is very durable, elastic, light and cheap.

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Why is it not recyclable?

• There is no machinery to recycle synthetic sponges.

• Although some sponges are said to be biodegradable, they still contain antibacterial chemicals such as triclosan, to keep the bacteria at bay. These chemicals are not ideal for composting either.

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Alternatives

• Loofah sponge 

• Silicon dish cleaner

• Wooden brush with compostable brittles