I have two BRS jumbo reactors. One for Rox carbon and one for GFO. I modified the in takes and outflows to accommodate larger tubing and mounted the reactors to a wall over my work sink. The sump has two Eheim 2000 pumps each to a reactor. The best part is the maintance which is quick, BRS develops many of their products very well and with much hobbist input. My only complaint is the leak prone connections which were poorly designed, but it was very easy to add new connectors to the reactors which are built like tanks. Changing media is like changing a tire at the Indy 500! Quick-quick-quick!