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Water Quality Crossword Puzzle

Across
Any substance or form of energy that can cause harm to environment and organism of an ecosystem.
The process of treating water so it is safe to drink.
The process of settling.
The action or process of filtering something.
The action or process of a liquid, especially blood, changing to a solid or semi-solid state.
Down
Phosphorous compounds used for growth by plants and algae.
The process of cleaning something in order to destroy bacteria.
The action of storing something for future use.