YES, it's is the calcium that makes the water "hard". That is why you use a cleaner that has a calcium remover in it to get those hard water stains off.
Calcium.
Forms of Calcium is what makes hard water hard
Hard water contains calcium and magnesium salts. Therefore, in hard water, soaps get precipitated as calcium and magnesium soaps which being insoluble stick to the clothes as gummy mass.
Soap scum is calcium soap of fatty acids. It is the result of soap in hard water-- the fatty acids in soap bond with the calcium ions in hard water and create an insoluble compound.
Hard water is a mixture: water containing calcium and magnesium carbonates, also some sulfates or chlorides.
Calcium.
Hard water contains carbonates and bicarbonates of calcium and Magnesium.
Dissolved minerals in the water. In most cases it is better to water your garden with hard water instead of treated water. The plants typically like the minerals found in hard water.
your butt hole
Forms of Calcium is what makes hard water hard
Hard water contains more calcium and can casue scaling on heater elements found in dishwashers, kettle and washing machines.
Forms of Calcium is what makes hard water hard
Hard water contain calcium and magenesium carbonates.
Typicall water hardness is caused from calcium and magnesium compounds dissolved in the water. The term "hard water" is used to describe water that has a high mineral content, usually calcium and magnesium in the form of carbonates, but may include several other metals as well as bicarbonates and sulfates, (water with a low mineral content is known as soft water). A high enough concentration of these metals in your water can cause white lime scales on surfaces which the water comes into contact with. Total water 'hardness' is reported as ppm w/v (or mg/L) of calcium carbonate (CaCO3). Water hardness usually measures the total concentration of calcium and magnesium, the two most common metal ions, although in some locations around the world iron, aluminium, and manganese may also be present at elevated levels. Calcium usually enters the water as either calcium carbonate (CaCO3), from limestone or chalk, or from mineral deposits of calcium sulfate (CaSO4).
Hard water has more calcium than soft water does
Hard water contains bicarbonates of calcium and magnesium or sulphates and chlorides od calcium and magnesium . It can be converted to soft water by boiling or by adding calculated quantity of calcium hydroxide .
Hard water contain calcium bicarbonate, magnesium bicarbonate in temporary hard water and calcium/magnesium sulfate in permanent hard water. Soft water contain doesn't contain these substances or only in very limited concentations.