Which method is NOT an effective way to remove lead from drinking water?

Chlorination is not an effective method for removing lead from drinking water because it primarily serves to disinfect water and control microbial contamination. Chlorine works by killing bacteria and other pathogens, but it does not have the capability to react with or remove heavy metals, such as lead, from the water.

In contrast, the other methods mentioned are effective in lead removal. Filtration can physically remove lead particles if the appropriate filter is used. Reverse osmosis works by forcing water through a semipermeable membrane that can separate lead ions from the water effectively. Activated carbon can adsorb lead under certain conditions, although its efficiency can vary based on the presence of other substances and water chemistry.

Thus, while chlorination is vital for ensuring the microbiological safety of drinking water, it does not address the issue of lead contamination.