If you can setup kalk the correct safe way with ph sensor cutoffs its a great way to go
Kalk delivers calcium, alkalinity and it chews up co2 that will achieve a higher ph.
Code-A is a calcium supplement and you would need to dose Code-B for your alkalinity.
Dosed those for years and still dose Brightwell magnesium when more mag is needed with my reef.
A two part (like the Reef Code) is a fine way to go. There is zero reason to focus on that brand rather than any of the many others or DIY. So is limewater (kalkwasser).