The Reef Pure RO Systems Dual GFO & carbon reactor features several advantages over other brands: Ultra-transparent media cartridge allows for clear viewing of reactor media Heavy-duty plastic construction. 12mm Quick Connect fittings with 1/2″ ports throughout reduce head pressure and provide ample flow rates. Swivelling & rotating 90° elbows on the inlet and outlet for convenient positioning and installation. High quality, easy to use double O-Ring push-connect fittings. Easy to operate, clean and maintain. Includes high-quality ball valve for precise tuning. Easily connects to 12mm rigid tubing Ability to run carbon and GFO at the same time. Holds three cups of carbon (Approx. 300g) or two cups of GFO (Approx. 290g) per canister Not suitable for use with biopellet media Accessories Included: 2 stage media reactor with 12mm quick connects 3 metres of black 12mm tubing 12mm ball valve for flow-rate tuning 2× refillable media reactor cartridges