How do I remove algae in my swimming pool?

Green algae is a common swimming pool problem, which may appear as a greenish growth on the floor and walls of a swimming pool, a green tint to the pool water, or greenish material suspended in the pool water. The only swimming pool chemical that will kill an algae growth is chlorine based swimming pool "shock". Shock is a granular form of highly concentrated chlorine, which quickly raises the chlorine level of the swimming pool water. The elevated chlorine level makes the pool water conditions unlivable for anything organic, and algae quickly dies.

Here is a nice video for reference only from the USA

1. Brush the walls and floor of the swimming pool to remove as much of the algae as possible. This will greatly reduce the amount of time it takes to kill and clear the algae bloom.
2. Ensure that the pH level is within the range of 7.2 - 7.6. This will ensure that any chlorine added will work more efficiently - high pH levels in particular will impair the efficiency of the chlorine doing its job. With the pool filter system running, add a chlorine-based swimming pool shock such as Superfast Granules adding 1 kg per 50 litres of pool water. 
3. Allow time for the shock to disperse, then add Algicide Ensure there is no other product in the skimmer nor any bathers in the pool. 
4. Once the algae is dead it will turn a white or greyish colour, and it will be suspended in the pool water or settle to the floor. When there is no longer any sign of the colour green in your pool, thoroughly vacuum the swimming pool. It is recommended that you vacuum dead algae to waste and not through filter.
5. Leave the product to act for 1-2 hours then brush off any algae that may be clinging to pool surfaces and agitate any areas where concentrations of product may still exist.
6. Run the filter for 24 hours then backwash to remove dead algae from the top of the filter media.
7. Add 300ml of Algicide per 50,000 litres (11,000 galls) per week to prevent more algae growth during very sunny periods. In hard water areas, increase the dosage by 50%.