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15 cards from this deck
Water that is safe for humans to drink
Clean, free from harmful substances, low dissolved salts, no dangerous microbes
Collection, filtration, sterilisation
Rivers, lakes, or underground sources
Filter bed with sand and pebbles
Killing dangerous microbes in water
Chlorine gas, ozone, UV light
Removing salt from seawater
Distillation and reverse osmosis
Requires lots of energy
Dirty water from homes and factories with organic matter and microbes
Screening and removing grit
Sedimentation - solids settle to bottom
Anaerobic digestion - microbes break down solids without air
Aerobic treatment - microbes with air, produces clean effluent
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