Review on Fluval 88G CO2 Bubble Counter Ounces by Melissa Moore

This bubble counter is super easy to use - just connect your air lines with strong, secure compression fittings, partially fill with water and attach to the tank with suction cups! It works great! A word of warning: This bubble counter does not have a built in check valve. So when the CO2 supply pressure drops (or shuts off), water is pushed back through the inlet. DO NOT connect this bubble counter directly to a needle valve and/or regulator without an intermediate check valve or you may damage your device. There are other bubble counters with built in check valves - some people may prefer these to this one. I was very happy to pair this bubble counter with Water & Wood 12 Pcs Aquarium Red Clear Plastic One Way Check Valves.