Just install an ultrafiltration, which not only purifies the water quality but also retains minerals. In contrast, the reverse osmosis effluent is close to pure water. Although there is no proof, many people are worried that it will affect the absorption of beneficial minerals.
The choice of ultrafiltration machine depends on the filtration accuracy, the origin of filter element and the type of membrane. At present, PVDA membrane is a better ultrafiltration membrane.