Elyse Knowles, one half of this years winning duo on The Block, has announced she'll be judging the 'Build a Loo' challenge for World Toilet Day.
During the event, different teams will have twenty minutes to create DIY toilets out of everyday household materials in a competition to create the best model toilet.
The event was created to raise awareness surrounding the lack of access to toilets across the world.
Currently, 2.3 billion people around the world don't have access to adequate toilets and almost 800 children die every day from diarrhoea caused by dirty water and poor sanitation.
Elyse, who is an ambassador for WaterAid, says: 'Living in Australia it is easy to forget millions of people in the world don’t even have clean water or a decent toilet in their community let alone their home. Visiting villages in Timor-Leste, I saw how clean water, decent toilets and good hygiene brings happiness.'