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1. Terraqua Columns - Background
Bottle Biology contains a wealth of information about the terraqua column project and further directions to explore. Definitely check out the Bottle Basics section to learn about working with soda bottles and also the Terra Column section for everything you wanted to know about building, maintaining, and studying terraqua columns. This site has a much more detailed step-by-step building guide complete with diagrams and troubleshooting.