Originally Posted by
pete159
http:///forum/post/3108209
i do not think you need to use both matrix and de nitrate.
i use the denitrate in one canister basket, but I will try matrix next.
In my 3 i have the sponges for first stage mechanical filtration, then the eheim pro substrate then kent denitrate.
It does not replace water changes in reducing nitrate, but it still helps, and is much better then using bioballs in those chambers.
I plan to use both because the De*nitrates says "flow rate should not excede 50gph" and if it does to use Matrix. Since the filter does an empty and fill routine I am hoping that I can get away with it, but using the matrix as a back up just in case. They both offer a little different filtration, so I figured why not give it a try. Yes, I still do my monthly or bi-weekly water changes.