I didn't grok the rationale for suspended Purigen until now. Very cool.
The matrix results are interesting. I run siporax in the sump while many run marinepure with our minimal rock scape. But have we recreated the whole nitrate factory problem again? Back when we had 1-2lbs of fiji per gallon, didn't have these issues. Yet it takes a long time for the NO3 -> Nitrogen bacteria to establish, much longer than the 'cycle' and by then people are already doing biopellets, carbon, or increasing inhabitants. I haven't read good articles on how much the nitrates are removed by bacteria in mature tanks. So many other variables are also in play.
Your purigen is also a great example of how each reef tank is different. The amount you run, packing density, and flow thru the purigen is related to your water volume, inhabitants, feedings, and maintenance volume.
The matrix results are interesting. I run siporax in the sump while many run marinepure with our minimal rock scape. But have we recreated the whole nitrate factory problem again? Back when we had 1-2lbs of fiji per gallon, didn't have these issues. Yet it takes a long time for the NO3 -> Nitrogen bacteria to establish, much longer than the 'cycle' and by then people are already doing biopellets, carbon, or increasing inhabitants. I haven't read good articles on how much the nitrates are removed by bacteria in mature tanks. So many other variables are also in play.
Your purigen is also a great example of how each reef tank is different. The amount you run, packing density, and flow thru the purigen is related to your water volume, inhabitants, feedings, and maintenance volume.