need help understanding dkh drop checker solutions - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 10-13-2012, 03:16 PM Thread Starter
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need help understanding dkh drop checker solutions

So here's my deal

source water
dkh 16
gh 22
ph 7.6 ish

My drop checker is a 4 dkh solution (came with checker)

With no RO unit to supply "better" water do i really need to change the solution ?
I have already discovered the threshold of having to high of CO2 levels the hard way. 2 corys RIP
i know drop checkers are not that accurate. That being said, so long as i know at what color the fish can't take it I can still use the drop checker as guide and not compare to the color chart that came with it correct ?

If i did want to pick the fly poop out of the pepper, how would i go about creating a solution that matches my water at 16dkh ?
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post #2 of 4 (permalink) Old 10-13-2012, 03:28 PM
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Hi Slippryrock,

In order for the indicator dye (bromthymol blue) in the 4.0 dKH solution that you are adding to your drop checker to indicate properly per the chart that is typically provided the water in the solution must be 4.0 dKH. Using a different dKH water in the solution will result in different colors indicating 30 ppm CO2.

This chart may be helpful. Note with a 4.0 dkh indicator solution a PH color of 6.6 in your drop checker indicates 32 ppm of CO2. However, if you used 10 dKH water in your indicator solution a PH color of 7.0 would indicate 32 ppm CO2. Current consensus is any CO2 level over 32 ppm is thought to be dangerous to some species.


Last edited by Seattle_Aquarist; 10-13-2012 at 03:52 PM. Reason: added chart; add'l info
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post #3 of 4 (permalink) Old 10-13-2012, 03:53 PM
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added add'l info above

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post #4 of 4 (permalink) Old 10-13-2012, 04:24 PM Thread Starter
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Thanks Roy. This is actually kinda what i was hoping to see.
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