adjusting KH and pH in RO/DI water - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 11-19-2006, 12:41 AM Thread Starter
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adjusting KH and pH in RO/DI water

I made my first batch of water for my tank today. I ran a GH test and everything came up perfect (thanks Equilibrium!). However, the KH and pH were off the charts--very low. I'm used to saltwater, where a good salt mix already has target levels, so I need to ask what is probably a really basic question. What is the best way to boost these with freshwater?
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post #2 of 7 (permalink) Old 11-19-2006, 12:48 AM
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You need to add something with carbonate. NaHCO3 (common baking soda) is usually used, but does add a pinch of sodium, which is theoretically undesirable. CaCO3 would raise both GH and KH, but it isn't very soluble and even a fine powder takes forever to dissolve.

1 tsp of baking soda will raise the KH of 50 liters of water by about 4 dH.
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post #3 of 7 (permalink) Old 11-19-2006, 12:57 AM Thread Starter
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So you bump up the KH and this will make the pH stable? That's how it works in saltwater, but you use calcium hydroxide, which I doubt is suitable for freshwater.

I want to make sure I use something that doesn't raise GH, as it's perfect right now.
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post #4 of 7 (permalink) Old 11-19-2006, 02:04 AM
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I use baking soda to raise my RO water to 3 dKH. Works fine.

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Barry
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post #5 of 7 (permalink) Old 11-19-2006, 02:36 AM
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post #6 of 7 (permalink) Old 11-19-2006, 02:11 PM
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banderbe is correct, to raise the KH and PH respectively, just dose your water with baking soda.

However, make SURE that you use pure baking soda. Arm and hammer is starting to get fancy with some of their products and it has more than just baking soda.

I use 1/4 teaspoon per 10 gallons to raise it approx 1 degree.
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post #7 of 7 (permalink) Old 11-19-2006, 07:48 PM
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I use RO, and don't dose anything for KH - which is near zero. My pH is at about 5.0. I inject CO2. No one/thing seems to mind.

Sergio C.
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