Which of the following was NOT a new technology to supply safer drinking 2 points
water in cities? *
Salt tablets
Filtration systems
Chlorine
![Which of the following was NOT a new technology to supply safer drinking 2 points water in cities Salt tablets Filtration systems Chlorine class=](https://us-static.z-dn.net/files/ddc/ac6da2964b493c77fe731614cfbd823e.png)