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Liquid refill solution for glass CO₂ indicators, designed to accurately assess CO₂ concentration in aquariums. Simply add 15 drops of the liquid to the glass indicator to monitor CO₂ levels through clear colour changes: blue indicates too little CO₂, green shows the optimal level of 30 mg/L (ppm), and yellow signals excessive CO₂ concentration. For best accuracy and performance, use with the Aqua Nova CO₂ glass indicator.
