U.P. Aqua Co2 Indicator

This is kind of a hard product to get wrong, considering how simple it is, so I wasn't surprised when it worked. The hardest part was mixing the proper kH reference solution to fill it with. This wasn't hard (baking soda and water), but it would have been nice if the included instructions described the process, rather than adding the indicator solution to a sample of tank water. Using 4 dkH reference solution will give you more accurate results than tank water, and is pretty easy to do if you have a kH test kit (like this one API KH (CARBONATE HARDNESS) TEST KIT. )

After adding the reference solution and indicator, I flipped it over and put it in the tank. It remained green. Hmm. Does it work? I turned off my co2 system for 24 hours. It turned blue. So far so good. Ever the scientist, I then cranked the system up. After a few hours, the indicator turned a yellowish-green. I backed off, pointed a powerhead at the surface to off-gas some of the extra co2. It turned back to green. Looks good to me.

Does what you'd expect. The only minor flaw I could find is that the suction cup will only stay put for about a week, slowly allowing air back in. I find myself squishing it back flat weekly, worried that it'll fall off.

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I was a little hesitant purchasing this....but it's simplicity is surprising and it seems to work as described. The instructions are a little sparse but in reality there's really not that much to say. Add the fluid...place in aquarium....compare the color to the included color chart.

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This is the first co2 indicator I have bought. It is made of plastic, but does the job. You could say it is better than glass because it's less fragile. I believe the indicator works, it changes color as I increase my co2 with the U.P. Aqua atomizer. The one issue I had was putting the fluid in the clear cap then attaching the base, but then you have to flip the unit over to get it facing the right way, but some of the fluid came out of the opening, which can be expected, I guess. Maybe I need more practice. Overall does what it was supposed to do.

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Yet another failure on my end for making this purchase, o ring wasn't tight enough to clear plastic cover and the solution slowly started to seep out and into my tank had to take it out not even 24 hours after I received it was hoping it would have worked because its not that big and doesn't look that bad either. Buy at your own risk you might get a good one