To determine the current oxygen content, then report whether steps need to be taken to increase oxygen content Rapid test for ventilation control: fill the test piece with water to be tested, add the reagents, mark the value of the sample on the colour chart Use: for new tank (once a week) and in case of signs of lack of oxygen. Clear change from yellow to dark red On the JBL/Themes/Aquarium or Basin website, you will find detailed information on water analysis and troubleshooting Contents: 3 reagents for JBL ProAquaTest O2
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