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Now we’re talking. Under-sink water filters are the real deal. They hide under your cabinet, like ninjas, and connect directly to your cold water line. You get a separate little faucet on your counter. Fancy, right?

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These things can remove everything—chlorine, lead, mercury, pesticides, and sometimes even bacteria. The Aquasana and iSpring models are popular for a reason: they’re workhorses. You’ll pay a bit more upfront (think $100 to $300), but the water tastes like rain from a mountain spring.

Downside? You’ll need a little DIY courage to install it, or call a friend who owns a wrench. But once it’s in, you’ll wonder how you ever lived without it. I’m not exaggerating. I’m emotionally invested.

What about Reverse Osmosis?

Oh, you want to go hardcore? Reverse osmosis (RO) systems are the Beyoncé of filters. They use pressure to push water through a super-fine membrane, removing almost everything—including fluoride and heavy metals.

But here’s the drama: RO systems waste a lot of water. Like, for every gallon of filtered water, you might toss three down the drain. That’s a bit rude to your water bill and the planet. Also, they strip out good minerals, so you might need a remineralization filter.

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If you live somewhere with truly horrific tap water (looking at you, Flint or old farm towns), RO is your superhero. Otherwise, it’s overkill. You do you.