How many drops of 4KH and PH liquid

Aeropars

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9 Jul 2007
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Leicester
Hi guys,

I'm interested to know how much of each solution you put in your drop checkers as you woudl get different results dependant on how much you add in.

For example, say you add 2ml of 4kh solution and 6 drops of ph reagent, this would give a darker and more fuller colour than say adding only 2 drops of 4kh solution.

I've been experimenting over the last few days with different amounts and have found that people adding a lot of PH reagent may struggle to hit the right colour whereas people only adding a little reagent may get a pale colour giving the impression your hitting a higher CO2 level than what you actually are.

I've been adding 4 drops to 2ml 4kh solution

Lee
 

GreenNeedle

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19 Jul 2007
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2,720
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Lincoln UK
I tend to put 2 drops of ph reagent in first and then fill until the bulb is half full with 4dKH.

The colouration differences could be looked at 2 ways

1 - Adding more gives exactly the same colour just darker
2 - Adding more dilutes the 4dKH more making it less accurate

Either way I tend to use 2 drops. I can see the lighter shade quite well and don't like it to be any darker :) I also prefer not to dilute the 4dKH too much.

AC
 

BINKSY1973

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13 Nov 2008
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201
Location
Oxford
On the bottle of 4dKH Solution i got from Aqua Essentials it says add 3-5mls of KH solution to drop checker, then ad 3 drops of Bromothymol Blue solution.

So thats how i do it.

Cheers Gordon.
 
Joined
26 Oct 2008
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1,646
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Cheshire
There is some much variation in peoples conseption of how much fluid / drops to add - is there common ground for the amount of fluids to mix, i am trailing to checkers:

1 x Red sea which states 1ml of tank water to two drops of there solution.

1 x Das 4 drops of Nutrafin ph to 2ml 4kh solution

Results two different colours - so which is right.

Paul
 

Steve Smith

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19 Jul 2007
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Leamington Spa, UK.
I was always told (I think it's on the AE site) that 3 drops of PH low range (bromo blue) and 1.5ml of 4dKh is what should be used. I find that tends to get my drop checker a smidge over half full :)
 

JamesC

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3 Jul 2007
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1,276
Location
Bexley, Kent
As Andy metioned earlier it is best to use more KH solution and as few pH drops as you can to preserve accuracy. For every drop of pH solution you add you are diluting the KH solution making the results less accurate and making you think that you actually have more CO2 in your tank than is being indicated.

The best I've found is to half fill or just over half fill the drop checker with KH solution and add 2 drops pH indicator. Adding more KH solution just slows reaction time too much. Each drop checker has a different volume so adding a set volume of solution isn't the best way to do it.

James
 
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