From the BRS website:
Quote:
Granular GFO is generally what most people are familiar with. Granular GFO works well in reactors that slowly tumble the material.
Pelletized GFO is slightly larger than the granular form and has a few slight advantages. The pellets are harder, have a more uniform shape/size and lose less material into the water. They also contain slightly more phosphate removing material for the same volume of material. Pellets work well in reactors but can also be used in a simple filter bag.
High Capacity Granular (HC GFO) is our premium GFO and comes with several distinct advantages over the other GFO's. HC GFO is able to remove roughly twice as much phosphate for the same volume of material. This means it will last longer and require less maintenance. The particles are extremely hard and even better then the Pelletized GFO at reducing the effects of water abrasion. HC GFO works very well in both a reactor and filter bag. If you are going to be using a filter bag with your GFO this is the preferred product.
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http://www.bulkreefsupply.com/a9/Gra...icle_info.html
GFO granular - 9 lbs - 2 gallons $130
GFO Pellet - 9 lbs - 2 gallons - $130
HC GFO - 8lbs - 1 gallon - $130
I'm pretty sure it's the weight of the GFO that determines it's absorbing capacity, not the volume. So I think the HC is really only 1 lb more expensive. I'll email and ask them.