So the next thing we had to figure out was how we could remove the oxygen, which we did by building this column which circulated some of the water, and put back CO2, which we did by bubbling the system before we recirculated the water.
A próxima coisa a descobrir era como poderíamos remover o oxigênio, o que fizemos ao construir esta coluna na qual circula parte da água, e devolver o CO2, o que fizemos borbulhando o sistema antes de recircular a água.