FAQ: How much nitrate will Seachem de*nitrate™ remove?

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 de*nitrate™. At that point de*nitrate™ will bring the nitrate levels down to 4 – 5 ppm after several days of use. Since de*nitrate™, 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.