The UNS CO2 Pro Bubble Counter lets you see and measure your CO₂ injection rate — the foundation of dialing in a planted tank. Gas passes up through a fluid-filled chamber one bubble at a time, so you can count "bubbles per second" and set a precise, repeatable rate. UNS is known for clean, high-quality aquascaping hardware, and this is a premium-built counter designed to look at home on a display setup.
Good to Know: A bubble counter is how you translate a vague "some CO₂" into an actual number you can adjust and reproduce — essential when matching CO₂ to your light and plant load. Many counters include or pair with a check valve to stop water siphoning back toward your regulator; combined with a drop checker (which reads the dissolved result), the bubble counter gives you control over the input.
How to Use: Fill the chamber to the indicated level with water (or mineral oil, which evaporates more slowly), install it in your CO₂ line after the regulator, and adjust your needle valve until you reach your target bubble rate. Mount it upright so bubbles rise cleanly through the fluid.
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