The most accurate way to test for copper is by using the Copper Test Kit provided with your Naked System.
Recommended Copper Levels are 0.2-0.5ppm.
It is a simple test that takes just a few minutes and we recommend making it a part of your weekly/fortnightly routine.
It is also important to ensure that the reagents for the Naked Copper Test Kit are not beyond their expiry date to achieve an accurate result. The expiry date can be found on the label of the bottle under the batch number as shown below.