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It is generally not harmful to mix salts in a water softener, but there are types of softeners that are designed for specific water softening products. When using alternative products, these softeners will not function well. Mixing evaporated salt with rock salt is not recommended, as this could clog the softening reservoir. It is recommended that

A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process.

Reverse Osmosis Systems. ... Reverse Osmosis Systems will remove common chemical contaminants (metal ions, aqueous salts), including sodium, chloride, copper, chromium, and lead; may reduce arsenic, fluoride, radium, sulfate, calcium, magnesium, potassium, nitrate, and phosphorous.

Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from water. The goal is to produce water fit for a specific purpose.

Reverse Osmosis is a water treatment process that removes contaminants from water by using pressure to force water molecules through a semipermeable membrane. During this process, the contaminants are filtered out and flushed away, leaving clean, delicious drinking water.

If you have an electric kettle, you probably have a filter like this built into the spout to remove particles of limescale.  Another method of filtering, chemical filtration, involves passing water through an active material that removes impurities chemically as they pass through.