API KH Test Kit (FW/SW) – Carbonate Hardness & Alkalinity

Product Description

Maintain stable water chemistry with the API KH Test Kit (Freshwater/Saltwater). This easy, drop-count titration test measures carbonate hardness (KH/alkalinity)—a key parameter that buffers pH and supports fish, plants, and corals. Simply add reagent drops to a 5 mL sample until the color shifts blue → yellow; the number of drops equals °dKH (≈17.9 ppm per drop). Regular KH testing helps prevent pH swings, supports healthy biofiltration, and improves overall aquarium stability.

Key Features:

• For freshwater & saltwater aquariums
• Measures carbonate hardness (KH/alkalinity)
• Blue-to-yellow color-change, drop-count accuracy
• Helps stabilize pH and prevent sudden swings
• Ideal for community tanks, planted tanks, and marine/reef systems
• Clear instructions; fast results at home

FAQ

Q1: What does the API KH Test Kit measure?
A: Carbonate hardness (KH/alkalinity), which buffers pH and keeps water chemistry stable.

Q2: How do I read the result?
A: Add drops to a 5 mL sample until blue turns yellow. Number of drops = °dKH (≈17.9 ppm per drop).

Q3: How often should I test KH?
A: Weekly for most tanks; more often after water changes, new livestock, or dosing.

Q4: What KH range is good?
A: Many freshwater tanks do well around 3–6 °dKH; marine/reef systems typically target a higher alkalinity range (measured as dKH). Always match your species’ needs.

Q5: Will this kit help with pH swings?
A: Yes. Maintaining adequate KH buffers pH, reducing sudden changes that stress livestock.

Q6: Is it suitable for planted or reef tanks?
A: Yes—consistent KH supports plant health in freshwater and alkalinity stability in marine systems.