 for the production of the carotenoid Astaxanthine from the green algae "Haematococcus pluvialis" or for the production of food supplement from the green algae "Chlorella vulgaris".These photobioreactors take advantage from the high purity levels and their efficient outputs.The biomass production can be done at a high quality level and the high biomass concentration at the end of the production allows energy efficient downstream processing.