If the water contains high levels of dissolved solids or heavy metals, a reverse osmosis filter may be the best choice; if the main concern is bacteria and viruses in the water, ultrafiltration or UV sterilizers are more suitable.

Reverse osmosis filter is one of the most efficient water purification technologies currently, capable of removing most pollutants. Water is separated under high pressure through a semipermeable membrane, most soluble substances and organic pollutants are intercepted.

The best purifiers for filtering groundwater are: 1. Reverse osmosis (RO) purifier, 2. Activated carbon filter, 3. Ultraviolet (UV) purifier, 4. Ion exchange purifier, 5. Ceramic filter purifier.

● Boil water: Effectively kills most bacteria and viruses, but is ineffective against some high-temperature-resistant microorganisms. ● Water filters: RO and UV sterilizers are very efficient at sterilization and virus removal, while ultrafiltration and activated carbon filters are relatively weak.

Due to its efficient filtering ability, the reverse osmosis filter can remove almost all dissolved minerals in the water. This means that the water provided by the reverse osmosis system is almost pure water and does not contain minerals.