Whole house filtering can do a good job with particle and chlorine filtration. It cannot get to the level of filtration that an undersink filter gets because this quality of filtration slows down the flow rate too much.
To get the best quality undersink filtration, you need reverse osmosis. Here are your options.
Reverse Osmosis Systems and RO Water Filters for RO Systems
The PT-3500 is the most popular system we have.
USFilter RO-3500 Reverse Osmosis System and Culligan RO3500 from Pentek RO Systems
Let us know if you have any more questions.
Thanks,
Jamin