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toddziegler 11-17-2012 10:15 PM

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

wkndracer 11-17-2012 10:31 PM

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.

Gold Finger 11-17-2012 11:57 PM

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.

KH2PO4 11-18-2012 01:26 AM

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.

chibikaie 11-18-2012 09:32 PM

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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