Seachem Fish PH Glass Refill

Seachem pH Checker is a simple glass monitor that helps you keep track of pH and CO₂ levels in your aquarium. It uses a colour-changing indicator solution that reacts to pH changes in the water, making it easy to see how much CO₂ is present. This is especially useful in planted tanks with CO₂ injection systems, where adding CO₂ will naturally lower pH. By monitoring pH, you can indirectly ensure your CO₂ levels stay safe and stable for healthy plant growth and fish well-being.