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Discussion Starter · #1 ·
Hi there folks,
I have a Blau glass c02 indicator, a bottle of 4dkh water, and the Fluval liquid. The F.L. is said to work with the Fluval C02 indicator, which is a plastic cone and that you should NOT add any water to the solution. Whereas normally you would add and mix the indicator liquid+4dkh together...

So do I add the F.L. to the Glass indicator straight or with the 4dkh water?
 

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It sounds like the Fluval liquid is simply 4 dkH reference solution mixed with the indicator solution (bromothymol blue).

You can use the Fluval pre-mix directly, or you can use the 4 dkH reference solution, but you will need to add a few drops of bromothymol blue so that there will be a colour change.
 

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Discussion Starter · #3 ·
Yeah that makes sense that the liquid would be the two mixed together. I'll go with that and see what happens.. Hopefully it'll give me a colour indication of my c02! :).
 
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