potassium carbonate question - The Planted Tank Forum
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post #1 of 5 (permalink) Old 11-17-2012, 11:15 PM Thread Starter
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potassium carbonate question

Does anyone have any advice for dosing pottasium carbonate for kh?

Thanks Todd Ziegler
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post #2 of 5 (permalink) Old 11-17-2012, 11:31 PM
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If you have a gram scale measure doses and mix into a 5g bucket then test results to establish adjustment values. (what I did)

W/O a scale do leveled mixing spoons 1/2 & 1tsp but realize that compaction and moisture effect the values slightly more than the scale but it's still minor.

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post #3 of 5 (permalink) Old 11-18-2012, 12:57 AM
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Also, I believe potassium carbonate (K2CO3) adds ~33mg/l K+ along with each 1 degree of hardness added by the CO3 just like K2SO4 does. It works well but you have to understand and want the K+ ratio. lots of extra K seems fine, but plants don't need KH so it's just a pH buffer issue. If you have two or three degrees in your tap I would not bother raising it. Over four degrees can limit some plants. Otherwise K2SO3 is supposed to be a good way to raise KH.

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post #4 of 5 (permalink) Old 11-18-2012, 02:26 AM
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From http://www.theplantedtank.co.uk/RO.htm
1.2g K2CO3 in 25 litres of water = 2 dKH

By adding K2CO3 to reach 1 dKH, you also get about 13 PPM of K.
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post #5 of 5 (permalink) Old 11-18-2012, 10:32 PM
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Thank you for the link! I've been wondering if I could use potassium bicarbonate in a similar manner, and that answers my question neatly.
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