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Let’s get geeky for a second. There are three main tanks for the job. Carbon filters are the rookies. They tackle taste and smell, but miss the heavy stuff.

Reverse Osmosis (RO) is the overachiever. It forces water through a super-fine membrane. It removes everything, even fluoride and microplastics. It’s like a science experiment in your cupboard.

Ultrafiltration (UF) is the middle child. It uses tiny hollow fibers to zap bacteria and cysts. It’s fast, doesn’t waste water, and keeps good minerals in. It’s the Goldilocks of purifiers.

For most of us, RO is the king. But be warned: it’s thirsty. It can waste up to four gallons for every one it makes. That’s a drunken party trick some models pull.

The 5 Best Under-Sink Water Filters, Tested by BHG

Installation: You can do it (probably)

Don’t call a plumber yet. You can install most units yourself. It’s like playing with plumbing Legos. You just connect some tubes, drill a small hole for the faucet, and click it together.

It takes about an hour. You might curse once or twice. But when you finally turn that tap and see the water flow, you’ll feel like a goddess of hydration.

Pick a system with "push-fit" connectors. They are idiot-proof. Even if you’re a certified klutz, you can handle it.