Neutro Bromo Blue For CO2 Drop Checkers - Aqua Essentials

Neutro Bromo Blue solution can be used with all drop checkers and is the only solution you should be using in a drop checker. Does not require mixing or anything else. Directions: Add a few mls to your drop checker, then pop the unit directly into your aquarium and wait to see the colour change. Ideal colour to aim for green. Blue means too little, yellow means too much. Adjust your CO2 output accordingly.