So how many stars are there in the Universe? It is easy to ask this question, but difficult for scientists to give a fair answer! Stars are not scattered randomly through space, they are gathered together into vast groups known as galaxies. The Sun belongs to a galaxy called the Milky Way.
Reverse osmosis. Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water.
Commercial (and Whole House) Reverse Osmosis (RO) Systems. The typical commercial reverse osmosis systems operate at water pressures between 100-225 psig. Their performance within that range depends upon the type of membrane(s) and the quality of the water being treated.