There are a lot of different types of water filters available in the market today. Most water filters physically block or entrap the debris by using a cartridge containing filtration media. Some systems even filter bacteria. Water filter jugs are also called pour-through carafes. They are frequently used in households with just one or two people. Water filter jugs filter chlorine, copper, lead and zinc along with some other sediments that give the water its bad look and taste. However, it is important to note that most filters do not keep out viruses, sulfates, harmful bacteria, cysts or nitrates. A number of jug filters also use de-ionizing crystals or an activated- carbon filter. The best part about using a water filter is that it is easily portable, does not require any electricity and it doesn't waste water. They are comparatively low priced and provide an easy solution to you water purification needs. The main disadvantage is that you need to keep refilling the jug if you consume a lot of water.