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.
RO technology has been used since mid 1900's and been used for years to remove contaminants and minerals from water. this technology has also proven to be the most efficient and cost effective process to convert brackish water, well water or seawater to pure drinking water.