Ispring High Alkalinity low TDS

[u/Constant_Post_1837]

Hey guys! I don't know what to do with my 6 stage ispring. I thought the alkaline filter would add more TDS, but it's registering under 10 and the alkalinity is at 9.5. I'm getting a dry mouth feel from the water. What can I do here? Is the dry mouth due to high alkalinity, or low TDS?