NextReef MR1 XL GFO and Carbon Filter Media Reactor

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This item has been discontinued.


NextReef MR1 XL Media Reactor

NextReef Reactors Loom Large Over the Competition! The MR1 families of Media/Substrate Reactors feature a massive 4-inch reaction chamber. The extra wide design maximizes water to media contact, increasing efficiency and minimizing dead zones in the reactor.NextReef Reactors have the largest capacities around, giving you the ability to run large amounts of media, or multiple products simultaneously. They`re ozone-safe, and perfect for phosphate control, de-nitrification or fluidized sand filtration. The NextReef MR1 stands over 23 inches tall... that`s over one gallon, big enough for large reef systems - up to 375 gallons.

Every NextReef Reactor is hand-crafted in the USA from the highest quality materials, and CAD engineered / CNC cut for a precise fit.


  • Recommended Tank Size: 375 gallons Marine / 750 gallons Freshwater
  • Height: 23" Overall Height / 21" Reaction Chamber (585mm / 535mm)
  • Width: 6" Overall (150mm) Reaction Chamber: 21" x 4" (535mm x 100mm)
  • Total Capacity: 230 cubic inches / 1.0 gallons / 127 fluid ounces / 3.8 litre
  • Inlet / Outlet: 1/2" 90 Degree Barb Fittings - fits standard 1/2" ID tubing

Product Manuals & Documentation

NextReef MR1 XL GFO and Carbon Filter Media Reactor

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

NextReef Systems
NextReef Systems operates a 4,000 square foot state-of-the-art plastics manufacturing facility in Bradenton, FL. The combination of precision CNC and laser cutting capabilities with master acrylic craftsmanship allow them to bring you the highest quality products for your aquarium, large or small. All of their products are made in the USA, from domestically sourced material (whenever possible!).



Experience Level: Expert

The Best!

running 2 of these reactors with phosban and the other carbon. NextReef reactors are the best you will possibly find! They are built like tanks ! There is expensive materials and machines that are used to make these reactors. the price is ideal and well worth the investment!

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Experience Level: Expert

Pleasantly surprised

Reactors appear to be the next great thing. Was very skeptical. Was in a situation where a Reactor was my only choice. Had to transfer the contents of a 75 gallon reef tank to de novo 60 gallon tank without life rock or skimmer. NextReef MR1 XL Media Reactor with 2 big bottles of lifeguard beads (plus Seachem Stability) quickly cycled and took the place of 100 pounds of live rock. Ammonium and Nitrites at zero. Using a deNitrafier for Nitrates.

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