I have been religiously testing my aquarium water every week without fail. And I have noticed that my nitrates after my cycle have been constantly at 20 ppm for the past few weeks. I can attribute this most likely to the daily feedings of frozen fish food and my filter socks. I'm also not the biggest fan of doing large water changes but that is a completely separate topic. So I need to find a way to reduce my nitrates without using exhaustive media that needs to be replaced frequently as my work schedule would not allow for such things. The answer that I may have found might just be the Deltec NFP509 Nitrate Filter. In a nutshell this little piece of equipment provides a place for the anaerobic bacteria that is responsible for utilizing nitrate and phosphates (from my reading) as part of their food source along with a carbon based fluid (1 part Vodka, 3 parts RO/DI) as their food. The result a Nitrate and Phosphate removing group of bacteria that can put a smile on my face. So lets see if this thing actually works. Assembly of the unit was simple It consist of just attaching the included Aquabee recirculation pump to the platform at the top of the body and connecting the water exit fitting. There is an included Probe Port that will allow you to install an ORP from your manufacturer of choice. This is an absolutely necessity in my opinion as it will allow you monitor the oxygen level present within the water inside the chamber. You can bring water in from your aquarium sump to the Deltec NFP509 Nitrate filter in a variety of methods. Besides the pump you will find two tubes (one with a built in check valve, which is used to feed the reactor with your nitrate fluid). The other is used to allow water from your aquarium to be injected into the reaction chamber fed by the recirculation pump. In my opinion their should have been a check valve here as well as I will elaborate on later on. I choose to feed mine initially using a Deltec Peristaltic Pump but eventually discovered that the slow rate of feed would hinder operation once the bacteria colony grew and my water flow level raised to accommodate this growth. I installed the Deltec NFP509 Nitrate Filter underneath my aquarium stand next to my sump and connected all the fittings. I went through the entire recommended process of starting the culture. Which involved adding water from your sump and then shutting off the feed pump to the Deltec NFP509 Nitrate Filter to isolate the water to bring the oxygen level down over the course of three days. During this time the recirculation pump is still running and you will be adding a dosage of nitrate fluid (1 part Vokda and 3 part RO/DO Water) twice per day and this is based on your device size so mine was 4 ml of Nitrate Fluid twice a day. During this process I monitored my oxygen level drop from 200 to 64. You will continue doing this until the 3rd evening at which you will turn on the feed pump and adjust the flow to 1 drop every 3 second from the Deltec NFP509 Nitrate Filter. You will continue this every three days slightly adjusting flow and the nitrate fluid used while you measure both the nitrate level from the effluent and the aquarium itself. The idea is to get to a flow where your aquarium nitrate is zero and the effluent is zero and stay feeding that amount of nitrate fluid.