Raising Calcium, Not Alkalinity

[LucidGoblin]

My Calcium is very low: 260 mg/L (ppm). My Alkalinity is good: 7.7 dKH (2.73 meq/L). I have a two part calcium/carbonate system. Questions:
Can I use just the calcium solution by itself as long as my Alkalinity stays within acceptable range?
Is there another way to raise Calcium without raising Alkalinity?
Is it normal to have such a divergence in the two readings?

 

[hkgar]

My Calcium is very low: 260 mg/L (ppm). My Alkalinity is good: 7.7 dKH (2.73 meq/L). I have a two part calcium/carbonate system. Questions:
Can I use just the calcium solution by itself as long as my Alkalinity stays within acceptable range? Yes

Is there another way to raise Calcium without raising Alkalinity?Yes, adding Kalk to top off water

Is it normal to have such a divergence in the two readings?

 

[Vinny Kreyling]

Keep an eye on Magnesium, they are all tied together.

 

[bertoni]

Kalk adds alkalinity and calcium, so that won't work. Just dose some calcium chloride, like Kent Turbo Calcium. It'll be fine. People do this regularly.

 

[yacn]

Seachem Reef Advantage Calcium - powder

 

[bertoni]

That's a fine product, too. It's mostly calcium chloride, with a bit of magnesium and strontium.