Whole house water filters are attached to the main water supply line to your house. All the water entering your home is treated. The faucets, toilets, shower, laundry room and all other water sources dispense filtered water. The goal of some filters is to produce better tasting water. Others aim to reduce contaminants and protect your health. If you are only concerned with taste perhaps an under sink filter is all you need.
If you want to safe guard the water that reaches your family, this is more important especially for pregnant, young, older or people with compromised immunity. Before deciding what whole house water filter is the right one for you, you will need to identify what contaminants are in your water.