Writing ielts task 1, please help me review.

Task 1: The diagram below shows how ethanol fuel is produced from corn

The given diagram illustrates different stages in the process of producing ethanol fuel from corn.
Overall, there are nine stages involved in ethanol fuel manufacture, starting with the input of material (corns) and finishing with the product used in the gas station.
First of all, picking corns and transferring them to storing. Following that, corns are put in a milling in order to grind, and then they are started to cooking in four hours after mixing with water. In around 48 hours, the mixture is kept in fermenting to ferment. At this stage, the resulting product divided into two forms: liquid and solid (by-product). The solid is removed and the remaining is conveyed to the laboratory. It takes five hours to filter impurities in the liquid to get the final product, ethanol. Finally, they are loaded onto the truck for delivery to the gas station. The process ends when ethanol fuel is given to use in the gas station.