This is my second reactor. I use GFO in one and activated carbon in the other. No leaks and work just fine for a reasonable price.

Excelente performance if is used with a 300 to 500 circulation pump, i have two months and the maintenance is low and very good results inmediately..!!

This thing does it's job and for the price i can't complain. The lid isn't hard to get off as long as you don't crank it down when you put it on. I've never had any problem. Remember it has an o-ring seal, you don't have to tighten it down too much. The media is a bit of a pain to put in, but it's not the reactor's fault.

very sturdy, works as described. water tight. seems just as good or better than some more expensive models i looked at. i use it to put Seachem's Denitrate in. and use the included ball valve to bring down the flow to less than 50gph so that it works to remove nitrates.

Perfect to my 250L reef. I recomend that...Now my nitrate is 0 before i had 20 or 10.. Very good.

This is a very useful product that helps me to bring the phosphate problem under control, finally. I use it on my 44 gal aquarium for a month now and it is still taking out all of the phosphate. However, it should be noticed that it will require some experience and skill level on getting this unit prepqred, particularly the initial backwash portion. I used a T connector to hook it up to a Maxijet 1200 pump and use a reducer on the outlet end of the T to create some back-pressure. This way I can use the same pump to provide both circulation (in the aqaurium) and enough flow to go through this Phosphate Reactor. I set this up in a sink and backwash the reactor with tap water (no PO4 in the tap here in Seattle) and ran it for at about 30 minutes to get rid of the fines as much as possible before I transfer it to the aquarium. Getting the right flow rate for an ideal fluidized bed could be tricky, but doable. I would not recommend using salt water from the tank for backwash and flow adjustment, wasting valuable salt.

The cost of buying 3 of these is the same as one of the more High class reactors. This comes with everything you need except for the pump.

Just like other reviews say, it does exactly what it says it does in a durable fahion. Evenly pass water through your phosphate media to get rid of of phosphates and ultimately control algae. Very happy with mine. NOt sure what they recommend but I use a maxi jet 400 pump for mine on my 90 gal tank so that water passes through it slowly.

I highlly recomend this phos reactor 150,im using it on my 125 g. reef aquarium and taking care of my phosphate issue

Hooked it up to a small pump and use it on my 30 gallon refugium and keeps my phosphates down

I use Fluval Biomax media when I want to boost biological filtration along with my wet/dry and switch over to Seachem Phosguard media in this reactor when I want to remove excess Phosphate. All Two Little Fishes products I've used have been great. They're well built, durable, and do exactly what they're advertised to do.Hagen Fluval BioMax Media 500G 17.63 ozSeachem PhosGuard 500ml

Have had one of these in use for about 3 years. No problems. Works great to control algae.