The CO2Art Drop Checker Solution (4dKH) is a pre-mixed indicator solution designed to help you accurately monitor CO₂ levels in your planted aquarium.
Used with a CO₂ drop checker, this 4dKH reference solution changes colour depending on the CO₂ concentration in your tank. When used correctly, green indicates optimal CO₂ levels for plant growth, helping you avoid both underdosing and dangerous CO₂ spikes.
The solution comes pre-mixed to the correct 4dKH concentration, eliminating the guesswork and ensuring more reliable readings than using aquarium water.
A simple but essential tool for anyone running CO₂ injection in a planted aquarium.
Features
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4dKH pre-mixed solution for accurate CO₂ monitoring
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Designed for use with aquarium drop checkers
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Helps maintain safe and optimal CO₂ levels for planted tanks
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Colour indication shows CO₂ concentration at a glance
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15ml bottle – long lasting with minimal usage per refill
