Making Dirty Water fit for drinking by Filtration
Basic Science and Technology
Primary 3.
2nd Term
Second term
Scheme of work with lesson note
Week: Eight
Class:Primary Three
Topic: Making water fit for drinking (Filtration)
Behavioural objectives:At the end of the lesson, pupils should be
able to:
1. explains and name some chemicals for filtering.
2. describe ways of filtering.
3. explains the changes that occur when alum is put in water.
Instructional material/Reference material:Sieve cloth, Coloured water e.g. muddy water, Basin, Disinfectants e.g. TCP, Dettol, Alum, Charts.
Building Background /connection to prior knowledge: pupils are familiar with water Purification
Content:
Filtration: The act or process of filtering; the mechanical separation of a liquid from the undissolved particles floating in it. Filtration is the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter. The liquid which has passed through the filter is called the filtrate.
Process of filtration
Filtration. Water flows through a filter designed to remove particles from within it. The filters are made of layers of sand and gravel, and in some cases, crushed anthracite. Filtration collects the suspended impurities in water, enhancing the effectiveness of disinfection.
Evaluation
1. explains and name some chemicals for filtering.
2. describe ways of filtering.
3. explains the changes that occur when alum is put in water.
