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.
DE POOL FILTERS. The D.E. filter is the most efficient type of pool filter on the market. It can trap particles down to 3 - 5 microns; well below what the naked eye can see. DE filters, like most pool filters, use a pressure gauge toindicate a need for backwashing when it reads 8 - 10 lbs. higher than its clean reading.E filters, like most pool filters, use a pressure gauge toindicate a need for backwashing when it reads 8 - 10 lbs. higher than its clean reading.