This product was recommended to me on another forum. Pond Matrix is suppose to reduce nitrAte in FW
aquarium because the material is very porous and able to house anaerobic bacteria. I'm going to try it out and see if it works. If it doesn't work, then no problem. I have good media for my bacteria.
I just got my Pond Matrix earlier today. $100 for 5g/20L of this stuff. I spent the last hour rinsing all of it and getting it inside a Brute trashcan for fishless (ammonia) cycling.
I got 750gph circulation pump aimed at the bottom matrix substrate. Some of the matrix is floating, but they will eventually sink. There is about 15g of water inside the trashcan. Seachem (manufacturer) recommends 2-4L of pond matrix per 100g. I should have enough matrix to decrease nitrAte to less than 5ppm.
I'll update in 1-2 weeks or whenever I have time to test water parameters.