I’m not naming brands, because you should do your own research. But look for a unit with a high rejection rate (98% or more) and a quick-change filter design. The APEC Top Tier or the iSpring RCC7 are solid. The Express Water RO5D is a bargain beast. All under $200. All stupidly reliable.
Read the reviews. Look for the one where someone says, “This ruined my taste buds for tap water.” That’s the one.
Reverse Osmosis Water Filter : Image Library : Interfuse
Installation: A comedy in three acts
Act one: You open the box. It has a million pieces. You panic. Act two: You watch a YouTube video. A cheerful Aussie plumber does it in three minutes. You feel brave. Act three: You finish in twenty minutes. The only problem is losing a tiny O-ring under the fridge. Your water tastes great. You didn’t call a plumber. You are a god.
That feeling is priceless. And it comes with every best value reverse osmosis water filter.