These attach directly to your tap, usually with a little switch. Flip it left for filtered, right for unfiltered. Convenience is the selling point, and it works—for a while. Then you realize the flow rate becomes a sad trickle, and the filter head looks like a grumpy robot lamp.
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I’ve got a love-hate relationship with these. They’re great for small kitchens where a pitcher takes up too much fridge space. But be warned: some models leak if you look at them wrong. If you’re a “set it and forget it” person, this might test your patience. Alternatively, you’ll just end up drinking unfiltered water because you’re too lazy to flip the switch back.
