It’s literally a drop in the ocean, but the innovative use of a water purification tablet could prove crucial in stemming the spread of Covid-19, especially among SA’s poor.

The tiny, chlorine-based effervescent Aquatab is now being punted by humanitarian disaster groups as a potential solution to costly alcohol-based sanitisers.

With thousands of small plastic sanitiser bottles discarded daily, the idea is to refill the bottles with water and add a tablet, creating a long-lasting and potent sanitising solution...