A drop checker would work. However, you shouldn't use the aquarium water in the drop checker.
12 ppm seems wrong to me because I am not injecting CO2 yet. If the average ambient level for regular water is like 2-5 dkh then 12ppm seems a little to far from that range. I am going to get some new kits and retest soon to make sure, but I think a drop checker would be an easy and accurate way to test my levels after looking into them some more.I don't understand why testing co2 the normal way won't work....In my understanding, driftwood drops pH by dropping hardness, including kH (If I'm wrong about this, then all bets are off). So, just test your kH and pH and it will tell you the co2. You don't need to buy a drop checker, although they are quite nice.
Why does 12ppm seem wrong to you? Are you sure your test kits are accurate?
Many use this method^. But its been said it takes more than 1 day for co2 to completely degass (unless perhaps you agitate it). I forget exactly, but think 2-3 days is more like it.You can also take a water sample, measure the PH. Let the Sample sit approx 24 hrs. Check the Ph again, a drop of 1 in Ph reflects 30ppm of C02.
Well, why rely on just 1 method anyway? Its easy to set a cup of tank water out for a few days and then measure the change. Get a drop checker too, then you have 3 methods you can compare results with. Just a thought.I've got an auto pH rig but I buffer my water to 7.5 w/ baking soda. Does that mean that Chuck's calculactor isn't correct? ie... pH of 6.8 w/ KH of 7.5 doesn't necessarily mean CO2 of 36ppm? BTW, I've been told I'd be better off not to buffer and just go with my tap of .1KH and pH of 5.95 and set the auto pH to pH of 5. If that's correct, I'll gradually drop it w/ weekly 50% w/c's but it seems VERY low.
I have the red-sea one which does seem similar in design. Even though the directions say to use Aquarium water you can, and should, use a KH reference solution.Anyone used the dupla co2 indicators before?