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The destruction of essential infrastructure in Ukraine means many children don't have access to clean drinking water.
Water sources have become increasingly polluted with mud, bacteria and toxic chemical residue from explosives.
New Zealand water scientist Tara Okan has created a water filter to help children on the front line make clean drinking water. There's also a givealittle to support the initiative.
Tara speaks to Jesse.
Photo: Supplied / Water4Kids