Hey sorry it took so long to reply...
If you google "Korralin Biodenitrator" you can find all the specs... I feed mine with a Maxijet 1200, but you can use as low as a 600, as long as you have enough pressure to get a constant drip or stream...
As for media... wine shops sell the sulfur beads for cheapest, and the media lasts for YEARS... the 2nd media is just large chunks of calcium carbonate... or you can buy it as "Crushed Coral gravel" at your LFS... this media sits in the top and I've noticed mine has shrunk significantly since I first set it up... but it's cheap too... this is the most cost effective and reliable way to eliminate nitrates... mine has been proof enough for me. 
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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