The GE Smart Whole House Water Filtration System, is beauty and function.  The setup is easy and straight forward with quick connect fittings for PEX and copper.  For galvanized, you may want to contact a plumber.  It has a rotating pivot head that allows for flexibility in install with vertical or horizontal configurations.  It filters the main water supply at the point of entry.  It is recommended to replace the filter about every 3 months or 20 thousand gallons.  It filters down to 5 micron and reduces sediment and chlorine taste and smell.  There are other filters that can remove lead etc allowing you to adjust the system to your needs.  

Now for the smart stuff!  It has an APP and is WIFI enabled.  It has alerts for a running faucet (great for when we forget to turn off the faucet our cat has been using), plumbing leaks, potential freezes and filter change alerts which is amazing!