Is there any way to lower solution of ph, without effect kh

[easypeasyac]

Hello;
Iam trying to lower pH with various acids but normally also it lower kh too.

Is there any acid which lower ph but not lower kh? It is quite impossible right?

Thank you.

[ChenBeier]

What is kh in your topic?
Karbonate hardness?

[easypeasyac]

What is kh in your topic?
Karbonate hardness?

Yes it is.

[ChenBeier]

This is not possible because lower pH will destroy carbonate to CO₂, what will evaporate, doesn't matter which acid is used.

[easypeasyac]

This is not possible because lower pH will destroy carbonate to CO₂, what will evaporate, doesn't matter which acid is used.

I got it thank you