And.... if you do the math you will know why that was said. The production for Omega 3 will give more initial profit where as animal feed, although a big market, would mean lower initial profit for the algae producer while they tried to gain a share of the market. (On the other hand the Omega 3 can be added back into animal feed.)
What heavy metals and contaminates? Well, the water does not have those things to begin with, the system is a closed system, the innoculant comes from BEHL in California. Water in both places is safe and used by the residents. So just how are these contaminates and heavy metals to be introduced?
Come on, you can do better.