I use biohome ultimate maxi in my marine setup in the sump and I also use to use it when freshwater awesome stuff the best media out there in my opinion and you will defo see a nitrate reduction using it once it has seeded properly
If you search through the FW forum people have set up filtration units for denitrification every so often. These are often at slower water flow as mentioned above, the bacteria which convert nitrates to N2 gas are anaerobic and work in the absence of oxygen. Most FW filtration units are high flow unless adjusted.
http://www.seachem.com/Products/product_pages/denitrate.html
Fascinating. Can it be used to eliminate the need for water changes, or do u just have to do them less often?
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No ideal in a reef tank due to the leaching that can take place have a google it's highly advised not to use them in a marine tank.ya know one of the best medias for de-nitrification I have found are the little pumice stones you use to scrub the sink with.
these bad boys rights here;
Heavy Duty Pumice Scour Stone Stick Cleaner Restorer Toilet Bowl Ring Sink Clean | eBay
only I get 'em at the .99 store....LOL
I have about 30+ in the sump. The fine pores allow for lots of internal surface area for anaerobic bacteria to thrive. I drill a few small holes through them and done. they are 6"x1.25"x.75".
only drawback is sometimes they float...LOL