Silicon is an important element, participating in the control of primary production and CO2 exchange between the atmosphere and the ocean and having enormous interest in scientific and technological applications. Our proposed research has the potential to make a great leap forward in understanding both the processing of Si and the production of relatively purified silica by sponges, also the basic drivers of those processes. The harnessing of the biological process is pivotal for future controlled production of purified BSi with low energy expenditure. Additionally, we expect to make evident the relevant role of sponges in the biogeochemical cycling of Si, particularly in relation with coastal systems and continental margins, where the link between Si and C cycles in the removal of atmospheric CO2 needs to be deeply revised to incorporate the sponge BSi interference. In these sense, our project seeks to bring the current conceptual biogeochemical model for the marine Si cycle into a more realistic scenario. Altogether, we would like to believe that this proposal has the potential to produce scientific insights that may be welcomed in international scientific forums concerned with biotechnologists, material scientists, molecular biologists, marine ecologists, and paleontologists.