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  • 01-27-15
    NEW Added 100 question practice test which shows answers immediately, instead of at the end.
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Glossary of Terms

Air Vent - A screened opening on the top of a gravity tank that lets the tank "breathe" as the tank is filled and emptied.

Quick Facts

Algae - Microscopic plants that contain chlorophyll, live floating (suspended) in water or are attached to rocks, walls and other surfaces, and grow and multiply through photosynthesis. Algae produce oxygen during sunlight hours, use oxygen during darkness, and affect the pH and dissolved oxygen levels in waster.
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