cunfused about how many types of GFO? 2 or 4?

Ralph ATL

Formerly mysterybox
I was always under the impression that there are only 2 types of GFO, pellet and granular, however Warner Marine & bulkreefsupply both sell a HC (high capacity) version, and ROWA is darker & moist. So how many types are there? I use the HC, it seems to be a little more efficient.
 

bertoni

Premium Member
There are a number of types from at least a couple of manufacturers, and some aquarium companies post-treat their products.
 
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