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Originally Posted by Zapins Hmm, this is very interesting. I have a KH of 0 naturally from the tap. However, my plants showed signs of Co2 deficiency when the pH reached ~5. Since then I have been buffering the water to about 4 degrees, and have been cautious of raising it higher. I was using a pH controller at the time.
Do you think that the controller was the problem because it does not take much Co2 to maintain a pH of 5 with 0 KH (hence the deficiency)? If so, are pH controllers useless if using 0 KH?
As an after thought, are there any strong benefits to keeping a KH of 0 vs. keeping it at 1-3? You mentioned plants grow better, exactly how do they grow better? |
Hi Zapins
The CO2 deficiency was due to the design of the CO2 Controller, because it is based on pH instead of the real CO2 concentration. I think simple needle valve would do the job more reliably.
There is nothing wrong with KH of 1 or 2 degrees except that it is difficult to maintain at stable level for long. And I noticed some sensitive plants need more light to grow as nicely at higher KH and some don’t grow at all.
Thank you
Edward