To increase water level and mag and alk added 1 gal DT water which was 1420 mag 8.5 alk.
Brought salinity down to 1.026. Will continue to lower. Balanced water change with ro checking alkalinity. Alkalinity still at 6.5
Alkalinity 7.5 prior to water change at least I think so. Did test twice. Added DT water that measured 8.5 dkh but added ro/di to lower salinity. Alkalinity afterwards at 7.5 will continue to add new saltwater combined with ro to lower salinity but keep alkalinity stable.