Before you get a whole house water filter, there are a few questions to ask yourself (and the manufacturer).
What does it filter out?
Most whole house water filter are designed to filter deposits up to 0.35 microns in size. Some are used to remove chlorine, iron and heavy metals. Some systems even include water softeners, UV purifiers and other special gadgets to ensure that the water is completely purified.
The problem is, you don't always need a fancy system that filters everything out. First test your water to see what's in it. If your water is safe and you just want it to smell not like a public swimming pool, a simple GAV cartridge might be enough.
Is NSF compliant?
If your whole house water filter is certified by the National Health Foundation, that's a good thing.
Or you can check if it has a WQA seal. These certifications mean that the filter has proven its quality through robust testing by one of the most prestigious organizations in the United States.
This does not necessarily mean that any product not certified by NSF is of poor quality. The cost of obtaining certification is very high, which will be included in the product price, which small enterprises may not be able to afford. Some people test in independent laboratories according to NSF / ANSI standards. If they are trustworthy laboratories, certification makes sense.
How long is the filter life?
It is much more difficult and time-consuming to install a whole house water filter system than to install a table top filter. Replacing the ink cartridge is less pressure than installing it, but there is still no holiday. This requires some skill. If you are not familiar with the job, you may have to call the plumber.
For these reasons, you don't want the entire house filter to need to be changed every few weeks or even months.
Find people who have completed their work for at least six months at a time. Depending on the water quality and usage, some filters can be used for several years or even ten years, and I fully recommend using them.