Go with an Revers Osmosis system its made from a permeable membrane that is back flushed to remove crap from the water. The under sink units are just for drinking water and are not fast ( about 25 LTs a day) Im sure if money is no object you could get a whole house unit. The under sink units I have cost around $400 and have a few inline filters included like a resin filter and a charcoal filter to polish the water before drinking. They cost about $50 a year to maintain until you need a new membrane then it's an expensive replacement. Good luck
