Slow Sand Filtration System

Description

The benefits of slow sand filtration are:

• Proven reduction of protozoa and most bacteria
• High flow rate of up to 0.6 liters per minute
• Simplicity of use and acceptability
• Visual improvement of the water
• Production of sufficient quantities of water for all household uses
• Local production (if clean, appropriate sand is available)
• One-time installation with low maintenance requirements
• Long life (estimated >10 years) with no recurrent expenses

The drawbacks of slow sand filtration are:

• Not as effective against viruses
• No chlorine residual protection – can lead to recontamination
• Routine cleaning can harm the biolayer and decrease effectiveness
• Difficult to transport due to weight – high initial cost