Before the Israeli blockade of the Gaza Strip was imposed, several repair works were under way to improve sanitation in the area.

But the projects have now been on hold for more than three years due to the siege.

The United Nations says the water system in Gaza is on the verge of collapse.

Al Jazeera's Sherine Tadros, reporting from Gaza, explains how overworked and outdated pipelines are polluting the water and making Palestinians ill.