Hard water is usually bound to have the problem of excess Total Dissolved Salts (TDS), in addition to physical, chemical and microbiological contaminants. These dissolved salts are found in exceedingly high levels than permissible drinking water limits, which is 500mg per litre. The TDS contents vary from calcium, magnesium, arsenic, iron, mercury, lead, fluoride and nitrates, the excess of which can lead to harmful impacts and ailments to various body functions and parts.

To effectively reduce the hardness/TDS from water supplied in your locality, the technology that would suit you best is RO. Reverse Osmosis is the reversal of the natural flow of Osmosis. In water Purification system, Reverse Osmosis is used to separate the salts and other heavy metals from water. Here's what it does to your water to make it potable:

The RO technology uses Reverse Osmosis for water purification, where in the water is passed at a high pressure through a thin film composite membrane which reduces the dissolved salts and removes chemical and biological impurities and also reduces the high levels of TDS to the permissible drinking water limits. It makes water free from physical, chemical and disease-causing microbial contaminants, while it also improves the taste of water making it sweet.