I've asked for advice on kalkwasser but now decided to go with 2-part. My tank stats are as follows -
Salinity - 1.025
Phosphates - .02
Calcium - 380
Magnesium - 1400
Alkalinity - 8.5/9
Salinity - 1.025
Phosphates - .02
Calcium - 380
Magnesium - 1400
Alkalinity - 8.5/9