Lifegard Aquatics Large Side Flow Turbo Reactor for Aquariums – for Use with Bio-Pellets, GFO, Carbon – Corrosion Resistant, Ceramic Bearings – Maximum Efficiency and Water Flow

Easy to replace media, takes 3 full cups of gfo (750ml) and does good job tumbling media with vortex type flow. Has adjustable flow valve, its quiet, disassembles completely for easy cleaning and has small footprint so it's easy to place in sump. Fits in 5g bucket for transport between sink and sump. Doesn't break the bank.

I have a 250 gallons aquarium. It took me less than 5 minutes to put it together. The first one I purchased was to use it as an internal biopellet reactor. I got so impressed that purchased a 2nd one to replace the external carbon reactor.

Product is well made and easy to adjust. I bought another one for nitrate scrubbing too.

use as a carbon reactor , i had purchased the medium reactor for my smaller tank i liked it so much that when i upgraded my tank i got the larger reactor for it. Reliable , cost effective, the pump is a beast on this had to turn it down the perfect in sump reactor for gfo. Carbon , or bio pellets if you have a big sump as i do!