Water filter systems are made of a screen with many tiny holes designed to remove contaminants. The tinier the holes the more contaminants the filters will remove or retain on the filter cartridge. The largest hole is called absolute filter while the average hole is called a nominal filter according to EPA and CDC rating. An absolute one micron filter will remove Cryptosporidium or other microscopic organisms of that size. Filtration technologies come as granulated activated carbon (GAC), solid carbon block, or reverse osmosis (RO). Some filters use fabrics, fiber, or ceramic screening to physically remove contaminants. The best option is to choose a unit that has been certified under NSF/ANSI Standards 42 and 53 for home filtering systems. Installation Types Under sink—This type is an excellent option for homes, apartments, schools, restaurants. Great option for if filtering is to be limited to kitchen for drinking.
Countertop—Best options for apartment dwellers especially if lease prevents plumbing medication; and for homes with limited space for a large installation of a large treatment system.
Pitcher—most pitcher filters use granular-activated carbon and resins to bond with and trap contaminants to remove taste and odor.
Whole house—this is an ideal installation for homes, restaurants, and schools that which to filter water entering the whole building.
Refrigerator—filter cartridge is attached to a refrigerator to enable cool filtered water to be dispensed.
Shower filter—attached to shower head to remove free chlorine that can cause dry skin, itchiness, or brittle hair. It’s good to buy a system that has the certification under the NSF/ANSI Standard 177.
Reverse Osmosis—When an RO filter forces liquid through a semi-permeable membrane under pressure, it leaves retains the contaminants. However, RO units use a lot more water than they filter, but they are very effective in filtering all disease-causing organisms and most chemical contaminants.
The best tips to selecting the right water filtration systems are third party certification, unit warranty, frequency of cartridge replacement, flow rate or pressure drop, contaminants the system is capable to remove, and the integrity of the manufacturer.
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