EOF Test Eassy Prompt

Eassy Question

How does water go from tap to tap?

1) Primary filtration

water is filtered through screens to remove large debris (Lake Erie)

2) coagulation

chemicals (alum)
added to the water to cause suspended solids to form clumps (flocs) that sink to the bottom of the tank

3) settling

water flows into large tanks, reminding solids sink to the bottom and are pumped out

4) second filtration

water is filtered again usually by very fine grained sand, charcoal (Brita water filter)

5) chlorination

chlorine is added to kill any remaining harmful organisms (0.5 or less we can drink)

6) aeration

air is forced through the water and bacteria are added they break down organic matter and remove bad smells

7) additional treatment

sometimes chemcicals are added to decrease the mineral content of water, fluoride may be added to prevent tooth decay

Steps in order

1) Primary Filtration

2) Coagulation

3) settling

4) 2nd Filtration

5) chlorination

6) aeration

7)additional treatment