Here is their response:
Great. We'll compare emails...
Great question. Wish I had better answers. I'm working with some high school engineering and biochemistry students in Kentucky and this was one of the projects I suggested for them, so I hope they'll do a good study.
But, for now all we have are dozens, if not hundreds, of reviews claiming reductions in nitrates. Some of these I take with a grain of salt. Those are ones that claim their nitrates are zero after a week. I'm a little sceptical, but of course I have no idea what sort of tank they have.
On the other hand, I've also seen reports that after a number of weeks or even months they've seen their nitrates reduced to 10 or 20 ppm. Now once again, there is never a great deal of detail so I can't know what their tank is like, but this sounds much more realistic to me.
I started this business about six years ago because I wanted to use the media in my Koi Pond Filters that I was hoping to sell at the time. I never did sell any containing Biohomeģ, but all of my personal filters are running on BioGravel.
I have two filters on my 5800 gallon koi pond that run a total of 84 kgs of BioGravel. These never reduced my nitrates which ran at 100 ppm for years. Of course this wasn't really too big a surprise since a pond of that size needs about 150 kgs of Biohome to achieve nitrate reduction.
I eventually added two Shower Filters holding 150 kgs of SuperBioGravel. This reduced my nitrates to between 30-40 ppm. I'm now using an RO system processing the pond water and my nitrates are running at about 25 ppm so I've taken down the Showers. We'll see if that affects the nitrates.
So I'm fairly confident that Biohome does reduce nitrates when an appropriate amount is used in accordance with our recommendations. We have found that water conditioners which also bind ammonia, nitrite and nitrate, which is most of them, conflicts with the bacteria that does the job in Biohome. In general, other chemical treatments and media can also stop the process.
In six years I've had probably five or six customers claim they were not able to get nitrate reduction. We've always provided these individuals with information about the amount required and cautioning them about water conditioners or other chemicals that might stop the process.
Unfortunately, I can't recall any of these that have responded one way or the other whether our advice allowed them to eventually achieve nitrate reduction. I did receive quite a detailed report from one customer that found that carbon dosing definitely improved nitrate reduction with Biohome. You can see her report here:
Hope you found this helpful. Thanks for your interest.
emailed ended, my thoughts:
I'd say I'm pleased but at the same time skeptical. As you said, it's definitely anecdotal. It neither proves or disproves the saying that biohome removes nitrates. In the end, it seems like it's a better idea to just get a normal, cheap media (I've used seachem biomax with great success, it handles a hell of a bioload and it's cheap), keep up on your water changes, and add plants if possible.