This episode contrasts the production of drinking water in the UK and Saudi Arabia. 

In the UK, abundant rainfall allows for the collection of freshwater, which is then treated through filtration and sterilisation. 

Conversely, Saudi Arabia, facing low rainfall, relies on seawater as its primary source. To make this seawater drinkable, it undergoes desalination processes like distillation or reverse osmosis. 

The episode highlights that while various methods exist globally, the specific techniques employed are dictated by available water sources and local environmental conditions. 

A significant drawback of seawater treatment in Saudi Arabia is the high energy consumption and associated costs of desalination.

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