These were the structures that would be floating at the surface made out of some inexpensive plastic material that'll allow the algae to grow, and we had built lots and lots of designs, most of which were horrible failures, and when we finally got to a design that worked, at about 30 gallons, we scaled it up to 450 gallons in San Francisco.
C'était ces structures qui allaient flotter à la surface fabriquées en matériau plastique bon marché et qui allaient permettre aux algues de pousser, et on a construit vraiment beaucoup de modèles, dont la plupart se sont avérés des échecs cuisants, et quand on est finalement arrivés à un design qui marchait, à environ 0,1 m3, nous l'avons agrandi jusqu'à 1,7 m3 à San Francisco.