[Canadian Man]

Time is going to depend on many factors Walter.

Just so you know if your adding a balanced addative like Kalk for Every 2.8 dkh or 1.0meq/l you raise your alk you will raise your calcium by 20mg/l.

So if you want to raise your alk to 10dkh you will end up with a calcium level of aprox 490mg/l(don't want to get the calculator out to get an exact)

IMO this ratio would be a little unbalanced.

I would add some alk buffer ( I use baking soda myself) to bring your alk up alone to a higher level then use a balanced addative like kalk.

cheers