B.O.D

supplies needed: black BOD bottle with glass stopper and plastic cap, dissolved oxygen meter or spec-20, 5 days, and a beaker.

procedures:
 * 1) obtain a black bottle that does not let light in and stopper with cover.
 * 2) bring the bottle to location
 * 3) submerge the open bottle under water and let it completly fill with water, then put glass stopper in bottle wile bottle is still in the water