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.
Reverse Osmosis (RO) Membranes: Commercial. Commercial reverse osmosis membranes are offered in a spiral wound configuration. A commercial membrane requires an operating pressure between 100 â 225 psi, therefore, a pressure pump capable of delivering such pressure is needed.