Is a Mag level of 1290 low enough to keep my water from buffering? I know it should be 1350 to 1500...right? I can't seem to get the Alk to stay at 4 meq/L nor can I get my pH over 8.2....and it keeps tending back to 8.1. My calcium is 450 so I can 't add Kalk.... I will be adding Mag tomorrow, but I am curious if I need to keep looking for other reasons.