How do you remove calcium deposits?
Calcium can be broken down with an acidic solution of some kind. There are cleaning agents sold which are made specifically for this.
You can remove calcium deposits using baking soda and white vinegar, depending on what kind of surface you are cleaning, you can scrub the area with either steel wool or a nylon scrubber. This is a lot less expensive than store bought products. You can also use salt and vinegar.
Well . . . there are no calcium deposits in water, there is only calcium. The deposits happen on things that the water falls on, then dries. What is left is a deposit. To remove the calcium (and magnesium) from water, you run the water through a tank full of little beads of "Filtersord". Most water purifiers use this along with charcoal, which removes bits of dust, and so forth.
In terms of removing calcium buildup and deposits from hot tubs, there are two products which are very effective. Spa System Flush will remove loose calcium, and calcium from the inside of the pipes and in the spa equipment. TLC works great for cleaning calcium and decaling vinyl liners, tile, fiberglass, and concrete.
One of the most common issues with mineral deposits people experience is the build up of calcium deposits in the body. One alternative healing method for removing the mineral deposits is to drink a mixture of honey, apple cider vinegar, and water until the deposits are removed from the body. The mixture helps to breakdown the excess calcium.
What can you use to clean off or scrape calcium deposits stained by algae from your pool without ruining the liner?
What causes heavy calcium deposits in swimming pool water and what is the easiest way to resolve the issue?
It's not clear to me how you would get calcium deposits on your face; maybe a word or two got left out. Anyway, they're almost certainly deposits of some calcium salt rather than calcium itself. As such, if you can't simply wash them off with water, you could use a dilute solution of a weak acid... vinegar would be a good choice.
It could be a few things, Alkalinity, high PH, Calcium deposits or skin and oils. Test the water to determine if PH and Alk. are in the correct parameters first. If Calcium is too high it will leave the deposits but most of the time the filter isn't able to remove all of the skin and oils that we lose from the epidermis quickly enough and they stick to the shell.