It's unbelievable that there are so many water filter systems available on the market today.
Their basic function is to clean tap water and provide contaminant free, purity.
As I began investigating, I started with a reverse osmosis water filter and was looking to see how it worked and if there were any positives/negatives before deciding how I felt about purchasing one.
Reverse Osmosis works by reversing water through a filter system that eliminates sediment and then uses a membrane that is semi-permeable to complete the filtering process.
After that, a carbon filter is utilized and then distributed through a faucet as "purified tap".
This unit can typically be installed by a reputable plumber and be used to purify water anywhere in the home.
However, after looking into some of the negatives of a reverse osmosis filter, I wasn't too impressed with the results.
This type of system is very efficient at eliminating toxic materials such as rust, lead, parasites, salt, sediments and sulfates.
Unfortunately, some of the negatives I discovered were:

• Only partial removal of viruses and bacteria that would require another type of water purification system to back it up.
  This doesn't seem to be a high priority for this type of filter process.
  
• It removes too many minerals that the body desires for good functioning, health and longevity.
  Minerals such as calcium, potassium and magnesium if eliminated force the body to draw from that which is stored in teeth and bones.
  Normally, this is caused by the high acid, low pH level of the water.
  
• It takes away water's good taste.
  
• It wastes three to four gallons of water for each one gallon it attempts to purify.
  
• As alkaline turns to highly acid water, it not only causes minerals to again be pulled from teeth and bones, but has also been known in some cases to increase the possibility of developing cancer since more free radicals are produced from this occurrence.
  
• It takes a few hours to install and may require a professional plumber.
  

So after considering all the negatives about reverse osmosis water filters, I found after extensive research that a multi-stage filter which employs essential and vital purification processes such as ion exchange, sub-micron and carbon filtration would be more beneficial in removing all traces of contaminants.
These included eliminating toxins such as VOCs (volatile organic chemicals) like pesticides and herbicides, chlorine, lead and other harmful materials, while it ensured securing the valuable minerals that were critical to the body and contributed to better health.
Now that you are armed with this information, instead of spending valuable time and money on a filtration system that will not do everything you need it to plus bring negative effects to your life, it would be wise to consider one that does, but also adds to your longevity.