This is among the more popular fluidized reactors in use today due to its smaller size, affordable pricing, and flexibility of use. The below information was taken directly from the manufacture’s website

http://www.twolittlefishies.com/documents/1202405781.pdf

PhosBan Reactor 150™

The PhosBan Reactor 150 is designed with the upflow principle to achieve the most efficient use of PhosBan® or other chemical filter media. By pushing water from the bottom upward through a dispersion plate, it forces an even distribution of water through the media, and prevents channeling. It can be mounted hanging on the back of the aquarium or below the aquarium. Hose barb connections are for 1/2 inch i.d. tubing. Includes 1/2 inch barbed ball valve for flow control, and hose clamps. Use with any pump having a capacity between 100 and 250 gph, but regulate the flow rate to the recommended 20 to 30 gallons per hour with the included ball valve.

I have been using one for a few months now and have found it to be very good value for the money.I am currently using mine for biopellets on a sumped 120 gallon FOWLR aquarium. I have friends and fellow hobbyists who swear by this reactor and have been using it for a few years with phosphate removing media.I really like using this reactor in a sump due to the small footprint it takes up and the fact I will not have to worry about it leaking when used in a sump. The below is a list of pros and cons that I have found using this reactor.

Pros:

-Small size can be used in all most any type of sumped set-up with minimal room lost.
-Can easily fit under aquarium stand if not used in a sump
-Can be used in a hang on back style set-up
-Comes with a built in ball valve
-Very reasonably priced

Cons:

-The supplied connectors often leak a very small amount.If used outside a sump or aquarium, you will need to add better clamps to connect the fittings and hose together in order to prevent any leaks
-You will still need to purchase a pump to use it in some configurations.
-It is not convenient to remove and take apart for routine cleaning or replacing media.
-Some types of media can clump up or just not move around the outside edges along the bottom of the reactor.However, this is a common situation to find in all reactors with a similar design.

One quick tip on using this in a sump, if you keep the portion of the reactor with the media in it below the water line in the sump, you will need lover flow rates through the media and the reactor will work better.  I took a picture and inserted it below to help explain what I am talking about.
Overall I am happy with the performance of this reactor and would recommend it to anyone who has a set-up with limited space for a reactor.