Allan, I think I have an extra phosban reactor running around you can have. I'll check in the garage in a bit.
As noted, slow flow is best.
With ANY mechanical filtration system, export of nutrients is accomplished by removing the media and cleaning it or replacing it. Leaving media in for more than a few days does nothing other than remove it from the water column, making your tank cleaner, maybe. It decomposes and adds to your bioload. One of these days someone will invent a filter that automatically backflushes to a drain every few hours.
Bill
215g FOWLR... and anemones, GSP, gorgonians... carp, that isn't FO!
"I killed my first SW Fish in 1971..."