Everything that went into our EcoFlask

Date of construction: November 9, 2005.

Materials list:

• 900 mL of distilled water


• 60 cm of Elodea (Alismatales, Elodea)


• 40 mL of duckweed (Alismatales, Lemna)


• 1 container of green algae (Chlorophyta, Cladophera)


• 400 mL of topsoil


• gravel

Original list:

• 1300 mL of distilled water


• 30 cm of Elodea (Alismatales, Elodea)


• 30 mL of duckweed (Alismatales, Lemna)


• green algae (Chlorophyta, Cladophera)


• 2 three centimeter rocks

We didn't put these materials or amounts of these materials for different reasons. First, we used less water because it overflowed; there was too much water when we put all the materials in the flask. We used more elodea because there was enough room in the flask for a longer piece of Elodea. We used more duckweed because there was enough room, and we didn't want to waste the left over duckweed. We added topsoil because rocks don't give any nutrition to the plants. We didn't use the larger rocks because we decided the gravel would provide enough protection and living space for the microscopic organisms.