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Re: [APD] CO2 drop checker
I believe Vaughn Hopkins wrote this email section below:
> The solution in the bottle that comes with it is essentially the same as
> that supplied by Aquarium Pharmaceuticals in their pH test kit, with
> bromothymol blue as the indicator. It takes very little bicarb to get a
> KH of 4 in 100 ml of distilled water. I put maybe a 32nd of a tsp in
> about 4 ounces of water, and got a KH of about 5 or 6. So I added more
> water, and rechecked it and was extremely lucky to hit KH4 exactly. I
> wouldn't use test strips for this. You need to be accurate to about +/-
> .25 in KH, and that means using 4X the measuring test tube amount of
> water and counting drops as .25 KH per drop - using a AP test kit where
> one drop equals one degree of KH doing a normal test.
> I suggest you search for the amount of bicarbonate of soda needed to
> raise the KH by one degree - I have seen it many times, but I can't find
> it right now.
Many thanks Vaughn. :-)
I'll look up what bromothymol blue is and where to get it when I run out of
my current solution.
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