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There are areas of  Indonesia where the water is very hard. East Java,Papua and NTT for example. A hard water depending on the amount of magnesium and calcium it has. The more calcareous soil is the hardest area has water.
Water hardness does not adversely affect health but if the appliances and pipes that break more easily.
Home water filters, types

Whole house filters (are easy to install you can install a professional or yourself if you are something hands, in department stores such as Leroy Merlin and Aki can find them in kit)

• Sediment Filter
• Filter chlorine, chloramine, hydrogen sulfide (odor)
• Filter iron and hydrogen sulfide
• Water purifiers (AV), water purifiers, bacteria and viruses.
• Ultrafiltration Filters

These filters are small, installation is straightforward and does not occupy much space

Sink filters, shower

• Reverse Osmosis Systems. One of the best known, ultra filtration that fits under the sink. Produce quality water, using small-scale technology used in commercial plants for bottled water. Reverse osmosis is able to eliminate most sediment and particles less than 0.0005 onlookers

• It also kills bacteria and viruses such as Cryptosporidium Giardia (Beaver Fever). Removes most heavy metals, fluoride, asbestos, chlorine. Removes volatile compounds including many herbicides and pesticides. It is one of the best options to filter water from home.

• Approximately filter about 190 liters of water a day, but can be teams that filter more or less.
  • Stage 1 – sediment filter
  • Stage 2 – Activated Carbon Filter
  • Stage 3 – Reverse osmosis membrane
  • Stage 4 – Post activated carbon filter

• There are models with a reverse osmosis stage, UV sterilizer. This step eliminates certain bacteria such as E. virus Coli, yeasts, certain viruses that may still have escaped to stage 4.

Shower Filters

• Carbon filter cartridges that fit a special piece to the shower.
• Easy installation remove chlorine, rust and odors. Effective to prevent mildew.
• Inhibit the accumulation of lime and other particles in the shower head.
• Soap and gel yield more and produce more foam.

• Help eliminate itchy skin

Filters that attach to the faucet or jars.

Take several activated carbon filters, filter water efficiency p but not the same as the systems of several filters such as reverse osmosis. These filters contain a smaller amount of activated carbon that other filter systems, but they are an economical option to filter drinking water