Before buying a filter, be sure to check out the different kinds available. Filtration systems can vary greatly in quality, efficiency, and price. The cost and trouble of keeping them maintained is an important consideration. Here are six systems available for purifying water. Always read the labeling on the product to see what it claims to filter.
Steam distillation is the surest method.
Water is heated to boiling, and the steam is collected and cooled until it condenses again without the impurities. This method works, but distillers are expensive, slow, and use power. Carbon filtration is probably the most popular system. Units containing specially prepared, porous carbon attach under the sink or at the tap. It works fast, removing chlorine, toxic organic molecules, and bad tastes from water.