raising gh without changing tds?

[y2kong]

Hi all,
I've been searching how to raise the Gh without raising tds but haven't had any success finding my answer. As of now, my Gh is at 3, tds at 209, and kh 0. I'm kinda nervous with the low Gh of 3. Any suggestions? Thanks in advance. Btw, I'm usng mosura mineral plus to supplement my ro water.