The reverse osmosis in the home is a sixth-degree filter. It is used to purify the city/wheel water, depending on the model that can process from 7 to 10 l/h.
It is installed (usually) under the sink, but it can be placed anywhere, depending on the free space, because the system is modular. Most of the purifiers work under city pressure and do not spend electricity. The quality of the purified water – better than any bottled water.