Task 1: 
The diagram below shows a simple system that turns dirty water into clean drinking water.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The diagram illustrates a simple device that purifies dirty water using a gravity-based filtration system. The system _______ of two containers made of plastic: a top one that acts as a filter and a bottom one that stores clean water.

Initially, dirty water _______ into the top _______ through an open lid. This top section is divided into three layers of filtering materials: _______ at the bottom, followed by _______ in the middle, and _______ at the top.

As the water _______ these three layers, it _______ and the impurities are removed. The filtered water _______ a pipe connected to the side of the upper container and flows into the lower container, also known as the storage drum.

The clean water is _______ there until needed. It can _______ be collected through a tap attached to the bottom of the drum. This simple, low-cost system can provide safe drinking water in areas lacking access to modern purification facilities.