What is the dropping of particles from water due to slowing of water movement?

What naturally removes most of the smaller particles from water?

What breaks down organic matter into carbon dioxide and water

What is the removal of particles by passing water through materials with smaller and smaller holes?

What process removes virtually all dissolved materials from water?

What process easily removes large particles from water as the movement of water slows?

What is the first step in cleaning wastewater?

What step in the treatment of wastewater produces methane gas that can be used for electricity and heat?

What can be used to kill disease-causing bacteria in treated wastewater?

Which agent for purifying water, does not kill bacteria but makes them unable to reproduce?

What happens in the clarifier tanks?

What happens in the digester tanks?

What happens in settling tanks?

What happens to the waste after the digester?

How do plants help clean water?

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