API (Aquarium Pharmaceuticals) - Water-Testing
The API Pond Master Test Kit tests for the four primary water quality parameters in koi ponds: pH, ammonia, nitrite, and phosphate using liquid reagents that give results by comparing water sample color to a reference card. It is the most widely used water test kit for pond keepers due to its availability, low cost per test, and reasonable accuracy for routine monitoring. Each kit contains enough reagents for 500 to 700 tests total across all four parameters.
$30 - $50 USD
| Parameters | pH, ammonia, nitrite, phosphate |
| Test Count | 500+ total tests |
| Method | Liquid reagent, color comparison |
| Accuracy | Semi-quantitative color chart |