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Well in theory the concentration of the solution (drops to 4dkh) would make a difference I imagine. There seems to be a vast difference between different brands. The lush stuff I have from APF is different to the stuff that came with my first drop checker from a side by side comparison. What I...

What im using is definitely indicator solution, just doesn't seem to have the same PH indicator range as it claims to have. Turns yellow for vinegar.

My problem was definitely a problem with the BB. Apparently the 0.04% solution I had didn't work, it just stayed constantly blue. I've read a few people have had this issue before. Using two drop checkers both with 4dkh, one with 3 drops of gush bb and one with my bb from the scientific company...

To mix bromo blue as an indicator solution from what I understand you mix the salts with ethanol so I imagine its the % of pure bromo blue in the solution? Maybe someone with more chemistry skills can confirm?

Hi Avit, I agree with you, it does take an age after a water change to get to decent co2 levels. But... I water changed on Saturday, added new premixed solution to the drop checker (it was lime green/nearly yellow by 2 1/2hrs later) then decided on Saturday night to give the bb and 4dkh another...

I've Tried with one drop of bb and with 3-4 as per the instructions on apf's 4dkh. Neither work. The bb that I've got is in the right ph range and should work. It reacts to vinegar very easily. I've messaged John at APF and he's assured me that the water is 4dkh so it must be the bb, I've linked...

I'm using pressurised co2, fe style. There is plenty of flow around the drop checker and it's in the same place as previously with the other checker fluid which turned lime green. Co is working, bubble counter is the same as always and I can see it entering my Rex grigg style reactor and...

Right I'd been using premixed drop fluid that came with my drop checker, constantly lime green / yellow. I decided to buy some bromo blue 0.04% and sme 4dkh water from aquarium plant food. I mixed the 4dkh in the checker with 2-3 drops of bromo blue, it stayed blue for 24hrs, confused I went...