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Detergents, such as dishwashing liquid and laundry powder, are synthetic soaps that are designed to lather in both hard and soft water.
Calcium and Magnesium salts in the water also react with detergents, but they form compounds that are soluble in water, so no precipitate is produced.

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Soft water does not react with soap to form aa precipitate, but it also does not taste very good.

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The biggest difference between Hard and Soft water can best be seen while doing daily housework. Hard water is to blame for dingy looking clothes, dishes with spots and residue, and bathtubs with lots of film and soap scum. Soap is less effective due to its reaction to the magnesium and calcium that lather is not as rich and bubbly.

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The most common water problem in the home is water with a high mineral content, or Hard Water.
A sign that you have hard water at home is the formation of limescale inside pans in wich you boil water.

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Soft water mostly comes from peat or igneous rock sources, such as granite but may also come from sandstone sources, since those sedimentary rocks are usually low in calcium and magnesium.

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Natural rainwater, snow and other forms of precipitation typically have low concentrations of multivalent cations such as Calcium and Magnesium. They may have small concentrations of ions such as Sodium, Chloride and Sulphate derived from wind action over the sea.

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Hard water is water that has high mineral content.

It is formed when water percolates through deposits of limestone, chalk or gypsum, wich are largely made up of calcium and magnesium carbonates, bicarbonates and sulfares.

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Soft water is water wich has relatively low roncentration of calcium carbonate and other ions.

It contains less than 85.5 parts per million of calium carbonate.