We all use water in our homes, and while the quality of water doesn’t matter for flushing your toilet (although some disagree) or cleaning chores, it is most important when we start drinking it.
Reverse Osmosis or RO water filters are preferred when it comes to very high levels of water purification. In these types of water filters, impure water is passed through a semi permeable filter which allows the water to pass through but stops impurities. Initially developed to rid seawater of salt, this technology got adapted into the mainstream filtration market and soon won over hearts of health conscious people.
How It Works:
Commercial RO filters use different stages of filtration apart from the RO in order to ensure completely clean water. There is usually a pre-filter which takes care of larger impurities, sands and sediments. Then the water is passed through the RO system comprising of a Thin Film Composite (TFC) membrane to filter out very small impurities and salts like Calcium and Magnesium. The water then is passed through another filtration step in order to ensure that you get perfectly clean water.
The pre-filter and final filtration techniques vary from model to model. Some models employ the carbon filtration technique while others prefer salt based filtration mechanisms.
Which Are The Better Models:
The iSpring 75GPD (reviewed here) is a 5-stage RO filter which employs some cool and effective filtration techniques. The first step is the Polypropylene sediment filter. The second step is a Granular Activated Carbon or GAC filter. The third stage employs a CTO or Chlorine, Taste and Odor filter. As the name suggests, this step takes care of any dissolved Chlorine in the water while improving the taste and making the water odourless.
The TFC reverse osmosis filtration is introduced in the fourth stage where all small and dissolved impurities are taken care of. The last stage is called total polishing. It gives the water a final scrub to ensure all kinds of impurities are gone.
As you can see, RO filters are much more sophisticated and efficient as compared to standard salt based and salt-free water filters. So if you have a hard water trouble in your area or if you generally like your water to be completely free from impurities, an RO filter is the way to go.