The Double Counter ER functions exactly the same as the original Double Counter but has an external port for quick and easy filling.
Over time, water level inside bubble counters will evaporate due to the constant stream of dry CO2 passing through. This requires the user to refill the liquid back to its original level. Traditional bubble counter designs require the users to disconnect the CO2 line from the checker each time it is refilled, which is inconvenient and may eventually loosen the tubing leading to CO2 leaks.
The Double Counter ER can be quickly filled simply by removing the silicone plug, fill, and reinstall the plug without having to disconnect any tubing. It is as easy as that!
Cal Aqua Labs glassware is hand-crafted using only the highest quality, laboratory-grade, borosilicate glass for maximum strength, durability, and visual clarity. Each piece is unique. Install the Double Counter ER inline within the CO2 tubing line and suction to the outside of aquarium. Always install a check valve below the bubble counter to prevent water from flowing back into the regulator.