How much baking soda? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 11-07-2004, 06:43 PM Thread Starter
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How much baking soda?

I'd like to raise the KH in my 10gal to 7dKH, but I'm not sure how much baking soda to add. Actually, I know exactly how much to add, but I'm not sure which KH reading to base the calculations off of. The specs from the city water supply say the KH is 64ppm, or 3.6dKH. In that case, I'd have to add 0.68 tsp. My KH test says the water is 4dGK, which would require 0.6 tsp to reach 7dKH. Which numbers should I go off of? I'd like to stick with the city's numbers, but after going through the pipes and whatnot, I'm not sure if that will alter the numbers from the treatment facility.
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post #2 of 8 (permalink) Old 11-07-2004, 06:51 PM
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I'd go by the testkit numbers. The city numbers could be an average of several sources, or could refer to a source different from yours, or might have changed since they were published.


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post #3 of 8 (permalink) Old 11-07-2004, 08:01 PM
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Ditto what Wasserpest said. And anyway, 0.60 and 0.68 teaspoons is hardly any difference in KH. Accuracy is greater lost by the use of measuring spoons and using improper amount of water for calculations (less then 10 gallons of water in a 10 gallon tank).
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post #4 of 8 (permalink) Old 11-07-2004, 09:40 PM Thread Starter
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Sounds good. I'll use the 4dKH reading and increase it by 3dKH.
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post #5 of 8 (permalink) Old 11-08-2004, 01:37 AM
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Since 3.6dKh rounds to 4dKh, I'd say you are both right. Remember - your test kit (if like mine) is only accurate to the whole dKh unit (one drop per dKh). Also, if you have a 0.68tsp (or 0.60tsp) measuring spoon in your house, I'd be surprised!

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post #6 of 8 (permalink) Old 11-08-2004, 05:23 AM Thread Starter
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Haha...I knew somebody would comment on teaspoon fractions. I have a 1/8tsp measuring spoon, so ~.6 isn't that difficult to get.

I went ahead and added five 1/8tsp...testing tomorrow.
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post #7 of 8 (permalink) Old 11-08-2004, 06:53 PM
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And if you really want to measure KH (or GH) by increments of 0.5, double the size of your water sample. Each drop of reagent will then count as 0.5 of a degree KH (or GH) instead of 1 degree.

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post #8 of 8 (permalink) Old 11-09-2004, 06:36 AM Thread Starter
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Neat, I didn't know you could double the water. Good tip.
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