Fauna Marin AquaHomeTest K is a professional-grade titration test designed for the high-precision determination of Potassium (K+) levels in marine reef aquariums. Potassium is a critical macro-element that exists at approximately 380–410 mg/L in natural seawater. It plays a vital role in coral nutrient transport, skeletal strength, and the vivid coloration of SPS corals—specifically blues and reds. Because Potassium can be depleted rapidly in systems with high coral density or those utilizing zeolite-based filtration, regular and accurate monitoring with the AquaHomeTest K is essential to prevent tissue loss and "fading" of coral pigments.
The AquaHomeTest K is engineered to provide the clarity and precision usually reserved for laboratory environments.
Fine-Scale Resolution: Offers a high level of accuracy with a resolution of 10 mg/L, allowing aquarists to detect even minor drifts in potassium levels before they impact coral health.
Sharp Color Transition: Features specialized reagents that provide a clear and distinct color change at the titration endpoint, eliminating the guesswork common in lower-quality kits.
Optimized for Marine Water: Specifically calibrated to account for the complex ionic background of seawater, ensuring that other minerals like Calcium and Magnesium do not interfere with the result.
High Yield: Each kit contains enough reagents for approximately 50 tests, providing a cost-effective solution for long-term reef monitoring.
Complete Kit: Includes all necessary components: high-quality glass cuvettes, precision syringes, and stabilized reagents to ensure consistent results from the first test to the last.
| Parameter | Recommended Value |
| Optimal Potassium Range | 380 – 410 mg/L |
| Test Resolution | 10 mg/L |
| Test Principle | Turbidimetric / Titration |
| Application | Marine / Saltwater only |
Why is Potassium important for my corals? Potassium is essential for the function of the "sodium-potassium pump" in coral cells, which regulates nutrient transport. Low levels often manifest as dull colors, particularly in Acropora, and can eventually lead to tissue necrosis from the base upward.
How often should I test for Potassium? In a well-stocked reef tank, testing once every two weeks is usually sufficient. If you use a Zeolite system or have very high coral growth, weekly testing is recommended.
Can I use this kit to test my freshwater tank? No. This kit is specifically calibrated for the ionic strength of saltwater. Using it for freshwater will result in inaccurate readings.
What should I do if my Potassium is low? If levels fall below 380 mg/L, you should supplement using Fauna Marin Elementals K or a balanced Balling system to slowly raise the level back to the target range.
Fauna Marin Multi Reference: The essential 250ml calibration solution to verify the accuracy of your Potassium test kit.
Fauna Marin Elementals K: A high-purity liquid potassium supplement to quickly and safely correct deficiencies found during testing.
