HagenKB

Nitrate Removal

If all phases of purification occur, do I need to change aquarium water?

If all phases of purification occur, do I need to change aquarium water?
Complete denitrification (Phase 4) requires very specific physical and chemical conditions.

Denitrification is rarely complete in aquarium or aquacultural systems. This leads to a gradual decrease in alkalinity and pH and an increase in nitrate. It is really very simple to change some water to recover alkalinity and reduce nitrate accumulation. It is not cost effective to try to avoid the simple exchange of small amounts of water. A water exchange of 10% / week is often recommended.

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