Seachem CO2 Indicator Solution is for use with the Seachem glass pH Checker. This indicator solution changes colour according to changes in the pH of the aquarium as a result of CO2 gas. The Seachem pH Checker makes monitoring CO2 concentrations and pH levels in planted aquaria easy. Directions:For use with the glass pH Checkers. Holding the funnel side of pH Checker upward fill the small bulb with 15 drops of indicator solution. Slowly turn the funnel side down avoiding any spillage of the solution. Insert pH Checker into aquarium funnel side down trapping air in the funnel. Attach the pH Checker in aquarium at the furthest point from any diffuser. The colour of the indicator solution will change yellow to green to blue according to the pH of the water. A more yellow colour indicates lower pH / more CO2. A more blue colour indicates higher pH / less CO2.
