Filtering out calcium

[waterbear]

calcium does not "filter out", it has to be removed by ion exchange or reverse osmosis, neither of which is practical for a pool in almost all cases.

Best way to deal with high calcium (short of replacing it was softer water, which is usually not practical) is to keep close tabs on pH and to keep the TA at the low end of acceptable to keep the calcium saturation index as close to 0 as possible (or even on the negative side). pH is the easiest factor to adjust and has the MOST influence on whether the water will be scaling or not.
TA, besides having a small impact on whether water can scale, has a very big impact on how fast pH will rise so lower TA generally means slower pH rise and therefore less chance of pH spiking high and creating scaling conditions.