the pink substrate used to feed cells for a lot of bio science work needs to be completely sterile and should be standardized for purity. They are cooking it by hand, guaranteeing neither sterility nor purity, most likely resulting in unreliable results. but at least its cheaper than having to buy it.
one of my friends used to make some cheap garbage to eat for lunch everyday. I told him once I'd love to try it so I can do the same thing and he told me "no you wouldn't". apparently it was awful. lol
but cheap!