[dennisw]

Of course health food store has to be cultured cleanly enough to be edible.... But growing algae for biomass to make oil would be about the same. Done in ponds. Except for Valcent which will hang plastic bags in the desert. I can just see the desert sun ruining those bags in months or a year

[count-your-change]

Valcent’s system video looked like it was either under cover or shaded.
Algae ponds for oil? At what cost? Thousands of square miles of ponds in the desert? not likely.