Description
Seachem de*Nirate
Removes nitrates, nitrites, ammonia, and organics
High porosity biological media
Pore size well suited for anaerobic bacteria
No danger of hydrogen sulfide production as with sulfur based media
denitrate is an economical, natural, porous material with a pore distribution and geometry that promotes both aerobic nitrification within the first few millimeters of depth and anaerobic denitrification at the core. The material has a high surface area and supports a high density of bacteria. Although denitrate has capacity to trap nitrate, this, as with other nitrate retaining materials, such as certain zeolites and synthetic resins, is quite limited and the primary mechanism of nitrate removal is anaerobic.
Live rocks or reef rocks remove nitrate by anaerobic denitrification. denitrate removes nitrate by the same process. Efficiency is magnified several folds by forcing the water to filter through the porous denitrate. As with reef rock, anaerobic conditions are achieved by the porosity and the depletion of oxygen by the aerobic process at the surface. Excessive flow rates should, therefore, be avoided, as they may impede development of an adequate anaerobic environment to support denitrifying bacteria.
denitrate is also an excellent media for aerobic nitrification and it makes an ideal biological filter in drip trays, canister filters, sumps, or even box filters. At high flow rates (greater than 100 US gallons per hour), it will function solely as an aerobic filter. At slow flow rates (less than 50 US gallons per hour), it will function as both an aerobic filter and an anaerobic denitrifying filter.
Directions
For best results, denitrate should be placed to assure the flow of water through it, such as in a canister filter, chemical filtration module, or box filter. Flow rate should not exceed 200 L (50 US gallons) per hour. If higher flow rates are unavoidable, use Matrix or Pond Matrix. It is best to rinse off dust before use. Once denitrate has been in use for several days, nitrate concentrations should start to fall and level off gradually at a concentration of about 45 mg/L as nitrate. As long as nitrate concentrations remain under control, the product is not exhausted. Each 500 mL of denitrate treats about 100200 L (2550 US gallons), depending on initial nitrate concentration and the current biological load. Enough should be used to remove nitrate at a rate at least as fast as the rate of formation. If very high nitrates are initially present, they should be brought down to less than 20 mg/L with water changes.
FAQ
How much nitrate will denitrate remove?
A: It is recommended that if nitrate levels are very high that they be brought down to at least 20 ppm through water changes before using denitrate. At that point denitrate will bring the nitrate levels down to 4 5 ppm after several days of use. Since denitrate, Matrix,and Pond Matrix are all biological support media, they do not actually ever exhaust, but they can grown less efficient with use by pore clogging. Prefiltering the water before it passes through these products will extend its useful life.
Should I use Matrix or denitrate? It seems like they both remove nitrate.
A: Matrix is best when you want a multi-purpose filter media to house both aerobic and anaerobic bacteria or when you cannot set up a filter with a flow rate of less than 50 gallons per hour. It will remove nitrate, but not as much nitrate as denitrate can. denitrate is better when you specifically want to remove nitrate and you already have plenty of biomedia for aerobic bacteria.
How often do I need to rinse or replace denitrate?
A: denitrate is a biomedia, meaning it does not exhaust over time, so you should never need to replace it. That said it is possible for denitrate to become clogged up with detritus and slime, so we recommend prefiltering the water using a sponge or filter floss to extend the useful life of the product.
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