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post #1 of 8 (permalink) Old 07-25-2009, 12:14 AM Thread Starter
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Kh?

What does it mean if my carbonate hardness or kh is 4 but my ph is above 7.8? I used a conversion calculater and it say my kh is 71 ppm what does this tell me about my tank?
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post #2 of 8 (permalink) Old 07-25-2009, 01:38 AM
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It tells you that you have moderately hard water and a moderately high pH.


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post #3 of 8 (permalink) Old 07-25-2009, 02:25 AM
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4 dKH or 71 ppm is the measure of carbonate (CO3^2-) and bicarbonate (HCO3-) ions in the water. It's called carbonate hardness or KH. Your level of KH has a good buffering capacity for a freshwater planted tank. It tends to hold a stable pH until too much acid is added. More Info Carbonate alkalinity Alkalinity


GH or general hardness which primarily measures the concentrations of calcium (Ca2+) and magnesium (Mg2+) ions determines whether you have hard water or soft water.

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post #4 of 8 (permalink) Old 07-25-2009, 03:39 AM Thread Starter
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Then what do I do to lower the Ph as I would like to keep discus?
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post #5 of 8 (permalink) Old 07-25-2009, 05:45 AM
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Use RO/DI water to lower the KH and GH. Don't use chemicals to lower it.

You can use CO2 to lower the pH.

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post #6 of 8 (permalink) Old 07-25-2009, 02:20 PM Thread Starter
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Thanks I appreciate the input It was very helpful!
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post #7 of 8 (permalink) Old 07-26-2009, 12:24 AM
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You are welcome. I hope that the links help you.

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post #8 of 8 (permalink) Old 07-26-2009, 01:09 AM Thread Starter
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Originally Posted by Left C View Post
You are welcome. I hope that the links help you.
They did, if I understand correctly my water is alkaline and a KH of 71ppm tells me that there are enough carbonates in my water to keep it that way, which also means I have hard water because of those carbonates. If I add ro water though wont it be difficult to ascertain the amount of carbonates left and thereby be difficult to control it? Also if I don't do any water changes wont the plants use some of the minerals therby softening the water or will peat moss do it? Just asking.
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