Description
GLA 4 dKH CO2 Indicator Solution – Lab Certified Analytical Standard
GLA 4 dKH CO2 Indicator Solution is a laboratory-certified analytical standard designed for accurate planted aquarium CO2 monitoring using a CO2 drop checker.
When combined with bromothymol blue or compatible pH indicator reagent, the solution changes color in response to dissolved CO2 levels inside the aquarium. A green color indicates an approximate CO2 concentration near 30ppm, commonly considered an ideal target range for many planted aquariums.
Each bottle contains 118mL (4 oz) of lab-certified 4 dKH reference solution and includes a pipette for easier drop checker filling.
- Lab certified 4 dKH analytical standard
- Designed for planted aquarium CO2 monitoring
- Helps improve CO2 drop checker accuracy
- 118mL (4 oz) bottle
- Includes pipette
- Compatible with standard aquarium CO2 drop checkers
Using 4 dKH in a CO2 Drop Checker
Add approximately 2–4 drops of bromothymol blue or compatible pH indicator reagent into the 4 dKH solution until a strong transparent blue color is achieved.
Install the drop checker inside the aquarium and allow approximately 2 hours for the solution to respond to aquarium CO2 levels.
CO2 Drop Checker Color Guide
- Blue: Low CO2 level – increase CO2 injection
- Green: Approximate optimal CO2 level (~30ppm)
- Yellow: Elevated CO2 level – decrease CO2 injection
Important: Allow approximately 2 hours after CO2 adjustments before evaluating color changes for accurate readings.
Compatible with planted aquarium CO2 drop checkers and bromothymol blue/pH indicator reagents.
Customer Reviews
-
This is the best 4DKH available.
Really wasn’t wanting to buy another bottle as the one I have is new from Nikoc-G, but boy is it totally garbage. First of all the color is way off and barely register any change with it. I tried multiple times by swapping it out to no avail. Moving forward I decided to buy GLA 4DKH. Now understand you have to add your own liquid ph reagent(liquid drops ph test kit) but holy crap was it worth it. Huge difference, vibrant color and noticeable change in color. I just use my basic ph test kit fluid from API and it’s been wonderful. I strongly urge anybody looking for drop checker fluid to try GLA fluid. It’s so much better and the colors are bright and rich. Not even sure WTH is wrong with Niloc-G stuff but I’m sure it’s just poorly made. Buy this instead and save yourself the frustration.
-
This is the best 4DKH solution you can find.
Im on my second bottle currently, but I have used many other brands of 4DKH. Im not an expert on chemistry but let me tell you what I noticed with GLA 4 DKH. GLA 4DKH response times are much faster. The color is more vibrant when you add the ph drops. It seems to me GLA 4DKH is a better product but I feel maybe its because its not premixed. I noticed all other brands come premixed. So, I emailed GLA. GLA advised to not premix the solution because the ph reagent will degrade overtime, thus degrading the 4DKH. This would then answer to why it is so sharp in color and responds much faster? It works great I can say that!
-
It tells you as it is
This is the only 4 dkh product I trust. Drop checkers are not perfectly accurate by design. They serve as a rough estimation for security. For that reason you want something that actually works as good as it can. Add an expired or poor quality solution to your drop checker and you won’t even get you rough estimate. Cheap, ready colored solutions from Amazon tend to turn green and stay green all night even when there’s no CO2. This one actually turns back blue at night and back to green during the day. It’s accurate and will last you for years.
-
Great stuff
Nice big bottle of perfect 4dkh solution. I like that it’s not premixed. I use API ph indicator to turn it a nice crystal blue color. This bottle should last me a few years.
-
Top Quality stuff
I use this in my DIY drop checker I made a few years ago and can honestly say this is the best 4DKH I have ever come across. It registers far more quickly than others and very accurate in its reading. You do have to add ph reagent to this, but this is what keeps this solution perfect while sitting on the shelf. You dont want reagent sitting on the shelf for 6 months or a year. You want both separate and only mix the two when your going to use it. Otherwise you need not look any further for a proper 4DKH solution for your drop checker. GLA has the goods.
-
The most accurate 4dkh on the market
I ordered this to replace my previous 4dkh I got off amazon which was some Nilocg brand. This is far superior, and I have no idea what that other stuff was but it is nowhere near as accurate and quality as this. I tested Nilocg brand and it came out to almost 5DKH! GLA 4DKH, you guessed it, spot on! I feel this is what makes it respond so quickly because after only 30 minutes of co2 being activated its starts to register color right away. The Nilocg stuff seemed to take several hours. This also comes in a large bottle format so it will last me years to come.
-
The very best 4DKH solution on the market
GLA 4DKH solution is and as to be the most accurate 4DKH solution I have ever tested(Hanna colorimeter) and used. I have tried every darn 4DKH solution on the market and GLA 4DKH solution is the only one that comes dead spot on 4DKH. I challenge anybody to find a more accurate solution, you wont though because I own all the brands from Amazon,Ebay and the other competitor brands. Whatever GLA is doing they are doing it correctly. This stuff has my drop checker reregistering color change within 15-25 minutes of my co2 system powering on.
-
The absolute best!
Im not sure how to say this but all I can say is that GLA 4DKH is in fact the best drop checker solution on the market. Its the real deal and its accuracy is unmatched by anything else I have used, and Ive used all of them. The response time on this 4DKH is literally twice as fast compared to anything I have used. Dont hesitate to use this in your drop checker because as far as Im concerned anything else you look at is garbage and waste of money. This stuff is the best!
