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.
Eram as estruturas que iriam flutuar à superfície feitas de um material plástico barato que permitisse que as algas crescessem. Criámos imensos "designs", mas a maioria foram terríveis fracassos. Quando, por fim, conseguimos um "design" que funcionava, para uns 140 litros, aumentámo-lo para 2000 litros em São Francisco.