Originally Posted by mr_X
Kalkwasser is not really for raising numbers. It's for keeping them stable. I would use a 2 part dosing regimen or a better salt mix closer to NSW
Agreed, it is also a different type of ionic calcium. If you need to raise ph when raising alk
(Part B) use sodium bicarbonate (baking soda) but if you want to raise alk
without as much ph increase, use sodium carbonate (soda ash). You can turn baking soda into soda ash by baking it in the oven for an hour to drive some of the C02 out of it. Since Kalkwasser also raises ph, you might consider using the soda ash. Use calcium chloride to increase calcium (Part A). BRS sells the chemicals as a kit. X is also right that a salt mix that has calcium chloride in it already is a option for starting out with higher calcium.
Good news is it's almost impossible to raise calcium to too high levels, it precipitates out. Alkalinity on the other hand can be lethal if it gets too low and it isn't good for it to get too high either.