show the growth pattern of all the three species studied for 27 days in the presence and absence of growth media (tap water). In Fig. 1, the gradual increase in chlorophyll a content with time indicates the growth of algae in all the three cases. However, while comparing the growth in BG 11 medium and in tap water alone (without the media), the chl a content of all the algae species was found to be lower in tap water than that obtained in BG 11 medium. The figure also indicates the slower growth rate of all the species in tap water. On comparison, Chlorella was observed to have the highest chl a content (3.88 μg/ml) followed by Spirulina (2.56 μg/ml) and pond water algae (1.84 μg/ml) after 27 days in BG media.