the best By mrribaudo on 11/20/2013
mrribaudo would recommend this product to a friend
I have tried many others, This one is the best in my 150 media reactor. Tumbles without channeling.
excellent By vladimir4076 on 9/2/2013
vladimir4076 would recommend this product to a friend
love it my phosphate is at zero with api test kit,using in sump flow going thru no problems at all just good results,thank you
Much more friable than I expected, but very effective By tramboneplayer5 on 5/18/2013
tramboneplayer5 would recommend this product to a friend
I have not used GFO before, and had set my expectations based on the videos I had seen of GFO tumbling in a reactor. I think that would turn this into powder and it would all end up in the tank. The 1/3 lb container included a fine mesh nylon bag, which is perfect for this. I dumped 1/3 of this (50 grams) into the bag and put the bag in a canister filter and in less than two days the phosphates were no longer detectable with a Salifert kit. There is almost no algae in the tank after one week. This is good stuff.