he Reef Octopus MF800B Complete Media Reactor offers efficient filtration for aquariums up to 300 gallons. With a 4" body diameter, it's suitable for activated carbon, GFO, and similar media. The reactor includes a feed pump for easy setup and use, suitable for both external and internal use in sumps. Featuring double containment plates with sponges, it ensures effective media containment. The package includes the reactor body, a powerful feed pump (OTP800) with a max flow of 420gph, and all necessary hoses and fittings for immediate use.