I have a lot of calcium in water from my well. For the last four years I have been using SCALEBLASTER electronic device to solve the calcium problem and it works OK: https://www.amazon.com/ScaleBlaster-SB-175-Water-Conditioning-System/dp/B0089FLDWM
It can be treated with a softener . Calcium cause hardness of water if in excess but there is no need to treat it if hardness is not too high.
A water softener is used to remove calcium which replaces the calcium with sodium from salt (NaCl).
If you need to treat large amounts of liquid and depending on your process you can heat up the liquid and it will drop out.
Use temperature variance as indicated above or soften with NaCl
The Lime Softening Process utilizes the addition of lime (calcium hydroxide) to remove hardness (calcium and magnesium) ions by precipitation. Softening is achieved by adding lime in the form of Ca(OH)2, which reacts first with CO2 to form calcium carbonate precipitate, and then reacts with multivalent cations to remove carbonate hardness, then reacts with anions to replace the non-carbonate hardness due to multivalent cations with non-carbonate hardness due to calcium. Lime softening process produces large volumes of sludge and as such is not used nowadays
Other than a Residential Softener is there a practical method of removing calcium for home (potable) water consumption?