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.
There are different types of reverse osmosis systems. They typically differ based on the number of steps involved. The most comprehensive RO systems are 5-step systems. These 5 steps include filtration through micron filters, carbon filters, and water being pushed through a semi-permeable membrane.