One Typha and one Pontederia crassipes will be taken from the 1.5 L tank and placed in a separate 4 L beaker filled with 3 L of sample contaminated water from the Drunken Moon Lake for each macrophyte. A big Pontederia crassipes represents Pontederia crassipes with a root diameter (measured from the end of the stem) larger than 10 cm, while a small Pontederia crassipes represents Pontederia crassipes with a root diameter of less than 10 cm. After the contaminated water has been poured into the beaker, a water quality sample will be taken from each of the respective macrophyte water beakers by inserting a Vernier Dissolved Oxygen Probe, Vernier pH