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Some water filter reviews discuss only the most common filtration product, carbon, and its uses in making water better and safer. Carbon works by adsorption, a process by which gases and dissolved solids adhere to the surface of a solid medium. When water passes through a carbon filter, the unwanted elements cling to the carbon and the water passes through. However, a more comprehensive water filter review will also discuss other systems as well. Although carbon-based systems are the cheapest and most widely used, there are other types of purifiers on the market. Distillation is an old technique for making salt water drinkable and is used today to make tap water safer. Distillation heats water to the point that it becomes a vapor which boils away impurities, then the vapor is converted back to water. Reverse osmosis is a complex procedure by which high-pressure water is forced through a membrane that acts as a very fine sieve. Water filter reviews will point out that while any filter will make water cleaner, there are advantages and disadvantages to most of them. Reverse osmosis is expensive, time-consuming, low yield, and wasteful. Additionally, many chemicals are molecularly smaller than water and are not therefore blocked by the membrane. Distillation is also slow-producing and requires maintenance. It is also based around the relative boiling point of all elements in the water; since many chemicals boil at a lower point than water, they are vaporized along with the water and are therefore not boiled away. Distillation and reverse osmosis also remove vital minerals such as potassium and magnesium from the water. Carbon filters are generally more effective in removing harmful substances from the water, states a typical water filter review, but most carbon purifier systems process only a small amount of water at a time, making them impractical for families. The cartridges need to be replaced often, and the overall system can be expensive for the amount of water they process. Additionally, most carbon filters exists in the form of a single cartridge to capture and strain out impurities. This one-shot type of system is not the most effective way of removing every bit of contaminant from the water say most water filter reviews. Most water filter reviews will say that a multi-step system is the best way to produce the cleanest, purest water. It just makes sense that running the water through more than one filter or process ensures that the end result is better than if just one step was involved. A water filter review of this type of product will generally discuss the difference steps that are involved in the process. Multi-step purifiers often have an ion exchange where the lead elements are exchanged for potassium. Sediment and other larger particles should be removed as well as microorganisms so that there is nothing in the purifier tank but absolutely pure water. When reading water filter reviews, make sure to keep in mind that while all purifiers can be helpful, you are best off with a multi-step system that captures everything you don't want to be drinking and nothing that you do!
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