Description
Characteristics
| Simply inject 1CC of CO2 Indicator solution into the cap of CO2 indicator. | Adding aquarium water is not necessary., Recommended to be changed only once a month., Not necessary to change solution every time a maintenance is done to the aquarium. |
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The ISTA CO2 Indicator Solution for Drop Checkers
This indicator solution is the fluid that makes a glass drop checker work, changing colour to reveal your tank’s dissolved CO2 level at a glance. The convenient part is that you simply inject around 1cc straight into the cap of the indicator; there is no need to mix in aquarium water, and one fill typically lasts about a month before it needs refreshing. That makes ongoing CO2 monitoring genuinely low-effort.
For planted-tank keepers here, a working indicator is how you keep CO2 in the safe band as our warm water and shifting daytime pH move things around. Because you only change the solution roughly monthly rather than at every water change, it stays out of your routine while still giving a reliable visual cue. Keep the bottle capped and out of direct light so the chemistry stays accurate.
Refresh it promptly if the colour stops responding, as old solution misleads. Browse the full CO2 systems range, and read our drop checker solution guide, indicator guide, and CO2 measurement guide.
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