What is KH in an aquarium?

KH , or carbonate hardness , refers to the concentration of carbonates and bicarbonates in the water. These elements play a fundamental role in the chemical stability of the aquarium, notably by acting as a buffer for the pH . In marine reef tanks, KH also supports the growth of hard corals , which use these carbonates to build their calcareous structures. A stable KH therefore helps create a healthier and more stable environment, limiting sudden changes in pH during the day.

Why monitor the KH of your aquarium?

KH acts as a chemical stabilizer . If its level drops, the pH becomes unstable, which can cause significant stress for your fish, corals or invertebrates. Conversely, too high a KH can impair the absorption of calcium, an essential element for the growth of calcifying organisms. In a reef aquarium , the general target is a KH between 7 and 9° dKH , although it can go as high as 12° in some specific protocols. To maintain this stability, it is essential to measure the KH regularly and adjust the values as necessary.

Products for measuring and adjusting KH

KH tests for accurate measurement

To accurately monitor your carbonate hardness, choose reliable KH tests like Salifert test boxes . Available as drop-in or electronic tests like the Hanna Instrument HI772 photometer . These tools allow you to track KH variations on a daily basis. It is important to use reagents that are not expired and to calibrate your devices if necessary.

KH boosters

When the KH level is too low, adding a Kh buffer can quickly raise the level. These ready-to-use or powdered solutions are easy to dose and work effectively to restore balance.

Remineralizers for osmosis water

If you use reverse osmosis water, consider remineralizing it with a marine aquarium salt suitable for your aquarium population. Some reverse osmosis systems for saltwater aquariums are compatible with remineralizing solutions, ensuring your water is enriched with carbonates for a naturally balanced KH.

Choosing the right KH product for your needs

Every aquarium is unique, and so are your KH needs. That's why it's helpful to choose a product based on its brand and maintenance method:

• KH product from Royal Nature
• KH product from Xepta
• KH product from Aqua-Médic
• KH product from AquaForest
• KH product from Aquarium System
• KH product from Aquatic Nature
• KH product from ATI
• KH product from Fauna Marin
• Grotech KH product
• KH product from Korallen-Zucht
• Microbe-Lift KH product
• KH product from Polyp Lab
• Red Sea KH product
• Salifert KH product
• Seachem KH product
• KH product from Triton Labs
• KH product from Tropic Marin