Is there any use for lime scale?

The lime scale is basically calcium carbonate, so it could be compressed together to make chalk! Calcium carbonate is also used in paint, ceramics, as the starting ingredient for builders lime, in nappies, adhesives, fillers and mixed with putty for stained glass windows.It's actually quite good for your health; calcium carbonate can also be used as a calcium supplement, to help build strong bones and teeth or as an antacid.