07-26-2020, 06:12 AM
Join Date: Apr 2005
Location: Brentwood, CA, USA
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| | Re: KH and plants
Originally Posted by orangeversion
KH is for pH and GH is for water hardness.As you have said your water is soft so you can increase GH
I haven't seen anything that makes me believe that pH is a parameter of importance to plants. Obviously the pH should not be below about 5.0 or above 8.0, but if it is between about 5.5 and 7.6 the plants are not likely to be affected. If you consider fish, the pH may be more important, especially for breeding the fish.
KH does affect the pH, but only if there is dissolved CO2 in the water. That is because the carbonic acid that is formed when CO2 is dissolved and bicarbonate ions form a buffer against changes in pH caused by weak acids and bases, but not CO2.