Water that is supplied to our houses and apartments has a lot of contaminants that negatively affect our health. For example, manganese in water negatively affects the human skeletal system.Water treatment and water purification are inseparable. Although these systems have different purposes they must be implemented in the house.To purify the water in the house or even to make it healthy a reverse osmosis purifying system has to be installed. The device has cartridges and a membrane inside that makes the water suitable for drinking since the water that has passed through the system is 99.8% purified.Reverse osmosis consists of:Polypropylene cartridge that clears pollution to 5 microns.Activated carbon cartridge (granular).Activated carbon cartridge (briquette).A membrane that allows only a water molecule to pass through, cleaning it from bacteria and viruses.Postfilter that corrects the taste and smell of water.To make water not only clear but also healthy it is necessary to choose reverse osmosis with a mineralizer that will saturate the water with healthy substances.Flow filter is an alternative option for water purification; however, such a system doesn’t have a storage tank and its filter is less efficient compared to reverse osmosis.