When you install a water filter at a point where the water supply enters your home you are in effect installing a whole house water filtration system. These filtration systems can be carbon filters, UV water purifiers, water softeners, or combinations that come in other different forms.
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If your water supply is from a well in your property your filtration system can be quite elaborate. You may require to first have a mechanical sediment filter, then a water softener, and ultimately a UV system. This system will then remove any dirt or debris in the water, soften it, and then disinfect it so that the water is safe to be used anywhere in the house. When your water comes from a city water supply, you will need your system to remove any sediments and any chlorine or other chemicals that are added to city water supplies. In either case, your water can then be used in kitchens, for drinking, for laundries and washing machines, dishwashers, coffee machines, and of course the shower heads and other water-using fittings you have in your bathrooms.
A whole house water filtration system removes all the contaminants that you do not want in your water. You may need to remove, hardness, iron, or just the chlorine that most city water supplies will have. So you need to have a system installed that will deal with your particular requirements and the quality of water that you have or receive on tap. This system treats water at its point of entry and distributes it to the entire home and to any point that you have a water connection. Most homes use filters that are fitted under sinks so that the water that you use for cooking or drinking is of safe quality. The system needs to be installed at the earliest point possible, and often this may require you to install it outside your house.
There are many advantages to installing a filtration system that can treat all the water that you use in a house. This will prevent scale formation on showerheads, shower curtains, or discoloration in dishwashers if you have hard water as a source of water. City water supply can have chemicals, besides chlorine, and also minerals if the water is hard. Your filtrations system should remove all of these and allow you to use water that can cause you no discomfort or problems in any other way.
Deciding on the right filtration system for your home will need you to analyze the water entering your home, to decide what it contains that you need to be removed. You will also need to take into consideration all the equipment and appliances that you have in your home that need water for their operation, and any restrictions that their manufacturers may have for their needed smooth operation.
The cost of any system will depend on the components that you use, and this can vary widely. It is important that you also take into consideration the maintenance needs for any equipment you have installed.