Greg: I went through a period where my nitrates were around 20 which isn't critical, but elevated none the less. I have 2 Phosban reactors (150s) and they are both filled with Seachem De*Nitrate. It took a couple of weeks to take hold, but once the proper bacteria started up the Seachem has been effective. Nitrates down to 0. Before you daisy chain the reactors, the de-nitrate goes for low flow (50 gallons / hour) so I have my GF in "bags" near the return as well as a bag of charcoal. Hope this helps. David
Oh, I have had the Via Aqua reactor and it works just fine. Don't remember the flow rate on the pump that comes with it. Slender profile to help fit into tight areas.