Australian Institute of Marine Science - Coral Fact Sheets and ID Friday, 18 September 2015 21:26 Guest Coral Identification / Keeping
Reverse Osmosis = This is a purification method for tap-water. Prefiltered tap water is pushed through a reverse osmosis membrane. Water that makes it through is considered pure, while water that does not, is sent through a special tube and is rendered impure. As it relies on water which is able to pass through the membrane, it also generates a large quantity of "waste" water which cannot be used. This is one of the best, but slowest methods of tap water purification.
What constitutes a Unit? - As you can see in the above photo, an RO/DI unit can consist of several chambers, each of which performs a filtering method. Depending on the models purchased, they can come with any number of "stages", some units even have UV stages for sterilization, but for our purposes, a simple "home use" unit will do just fine. As such, I would buy a unit that has at least the following four stages built into it. Sediment Filter - Removes the largest particles from the water, which helps to prevent the finer filters next in line from becoming clogged with material. Carbon Filter - Removes by adsorbtion dissolved organics and chlorines which would damage the reverse osmosis membrane. Reverse Osmosis Membrane - The actual membrane that allows only certain sized molecules to pass through it. While it does a good job of purifying the water, it does allow compounds / molecules of substances that should be removed, which is where the dionizing filter comes into play.Dionizing Cartridge - Contains a resin which adsorbs those elements that were small enough to pass through the RO membrane with the water molecules.
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