The RO10 is larger than RO Mini and XF10 combined using 4 inch diameter filter elements. It is modular in design and can be ordered with 2, 4, 6, or 8 elements in series. It can then be added to at a later time for increased output. The pressure vessels can be either 316 stainless steel or fiberglass for extra savings. Manual or fully automated controls are also available. Please see XF and RO Mini pages for all MF, UF, NF, and RO membranes available.