I would say the primary nitrate control mechanism used in SW
systems today is the DSB
. Granted, they aren't perfect and do have potential for problems, I think it is the most effective nitrate control available at this point. You will get some nitrate reduction in the inner areas of your LR
as well. Natural nitrate reduction takes place anywhere in the tank that is anoxic or has an extremely low oxygen content.
Another less popular option is the coil denitrator. This is basically a length of icemaker tubing (like 50 feet) that water is pumped through very slowly. Aerobic bacteria will grow in the first few feet of the tubing and use up all the oxygen in the water. The anaerobic bacteria will grow in the remaining length of tubing and consume the nitrates. The water coming out the other end is nitrate free. This is a very slow process though with the flow being measured in drops per minute.