Spirulina Cultivation & Market

Hello Friends
Does any one can tell me about Spirulina cultivation process & about its market. I have visit one training center to near my  place but not getting marketing idea. Please share if you have any idea about Spirulina market



what is the difference between ‘azolla’ and ‘spirulina’. Are both are same? If not what is the use of ‘azolla’ , and ‘spirulina’.
How it is cultivated? do we need to construct tanks for growing ?
is it have market in India and how it is marketted as such or after processed.I request clarification please