Some organic compounds, such as phenolics humic acids cannot be removed effectively by skimming, biological filtration or activated carbon. These compounds can become refractory (difficult to remove) and have a negative effect on the water quality.
The Salifert Organics test is a semi-quantitative measure for such compounds, and no other manufacturer offers such a test kit.
Number of tests depends on degree of pollution.

• Sufficient for 50 tests