Bio Pellet Plus Reactor uses a proprietary designed pressure plate to evenly tumble every type of bio pellet to perfection without higher water flows completely negating the need for the two-pump recirculating design. No sponges are used to ever clog or replace. A highly engineered laser cut acrylic baffle, with its own grip, keeps all bio pellets within the reactor’s chamber and out of your saltwater aquarium. Bio pellets are made primarily of a biodegradable polymer that promotes aerobic and anaerobic bacteria making it a viable way to consume nutrients (nitrates and phosphates) within the reactor. Designed and hand-built in the USA and Italy with 100% American-made acrylic construction.