"We thought why don't we start a company that addresses this possibility of using capitalism as an aggressive way to solve the glaring problem of water pollution, " he said.

CNN: Eco-friendly bottle for ethical water

We had a major problem with water pollution.

BBC: Why are there hawker centres in Singapore?

It's not just flood water, it's sewerage coming up too and it's a serious pollution problem.

BBC: Thames Water says drainage system 'overwhelmed'