I use BRS's GFO
. It's good stuff, but in terms of processing at a higher flow rate that's not real advantageous.
First, higher flow rates induce more tumbling, which can actually cause the media to break down into dust and pass through your reactor. You want some tumbling of GFO
, to keep it from solidifying, but not so much that you're turning it into dust.
Second, longer exposure time of the water to the media is better for actually allowing the media to actually absorb the phosphates.