I know I had a lot of confusion when I first hit the Bio Pellet scene. There have been many good reviews on here of the Pellets themselves but I wanted to start one on Reactors. Please feel free to chime in with your experiences on Reactors especially on ones I have not owned! BRS Bio Pellet Reactor Pros: Cost- 49 bucks without pump Name- BRS offers the best instructions on bio-pellets i have seen in the industry Build- it seems to use the same high quality construction you could expect from more expensive Reactors Moddable- at this price range- why not cut it up! Cons: Capacity- with only one size a too large tank couldn't get the proper bio pellet coverage Functionality- I had some serious issues with the pellets tumbling correctly (see below). Pump- it seemed to really need a mag drive 3 or above pushing it, I did not experience success with a MJ Overall- This was my first Bio-pellet reactor and it did what was advertised-reduce nitrate/pho which helped prevent algae. As mentioned above, its low price and availability from a company you probably order from anyways makes the product appealing. The Major challenge i experienced was not getting enough flow from the MJ pump (one of 2 recommended) and needing to upgrade to a mag drive. I also struggled with this pump and algae getting stuck in the pre-screen and clogging it often. I found I would have to change this weekly. I saw an article on here from Vinny (thanks Vnny) with a great mod to help with this but I still seemed to have to clean it bi-weekly or better to keep the flow going at proper rates (Key with pellets). Disclaimer, i do have a ton of algae in that tank at the time this was occuring so you may not experience this frustration. All in all, I would say the BRS Bio-Pellet reactor is akin to a eshoppes type skimmer- gets the job done for cheap but at some point you will likely want to upgrade.