Hi guys, i am wondering if there is anywhere i can buy 4 DKH solution for my drop checker? I have a 13L cube micro tank which is on co2 for my plants. I have read that i will be needing a 4DKH solution for my drop checker in order for me to know if i am getting the correct amount of CO2 in my tank. Please advise and many many thanks in advanced!

Yeah, the other brands that also have pre-mixed indicator solutions are Ocean Free and ISTA, can use those too.
Here is a photo of the Ocean Free version:
As as shown in the instructions, just drip a portion into the drop checker and can use immediately, no need to mix with any water.
Oh yeah guys... by the way how long do i leave the drop check in the tank for before i need to change the solution inside?
You can get them from most of the popular LFS... i got mine from Polyart and Seaview.
From my experience, the solution can last for many months and still generate readings... though the bottle instructions often say change every 2 weeks, i guess that's to encourage repeat purchases.
Usually you'd change the solution when it evaporates or if you find that the overall color is fading.
Just got from East Ocean, 3 bottles left
Jan




ops..was busy recently didn't see this.
I still have like 500ml of 4dkh I made 2 months ago, but don't know if still can use else just pour you a small bottle.
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