I emailed them a similar question. The answer was that the High Capacity GFO absorbs about 2x as much as the pellet or regular granular making it the most cost effective to use. I'm currently using the HC GFO in my reactor, it is WAAAAY less dusty than RowaPhos. It seems to work about the same or maybe a tad better than RowaPhos tsp to tsp.
If you actually want them to answer your question, you are better off emailing them.
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~ Mindy
SPS fanatic.
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