I bought this unit to remove fluoride from my drinking water. Prior to my purchase, I spent several hours learning about reverse osmosis and comparing the various units that are available for sale online. This Vevor unit compares very favorably to the others, especially considering the price point. Some of the competitor units tout a higher pure to drain ratio as water \"saving\", but this just means that successively more concentrated waste water passes through the filters several times before being discarded. While this may save a few gallons of water on the front end, it shortens the filter life. This unit works very well and we are pleased with it. The only downside is that Vevor currently does not offer replacement filter cartridges for sale individually. I am hopeful that they become available before the initial set is due to be replaced (in about a year).