You don’t need to be a plumber. Most of these are plug-and-play or use simple push-fit connectors. You’ll be done in under an hour. Promise.
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One tip: measure your space. A standard under-sink cabinet has about 15 inches of height. These units are engineered to fit exactly there. It’s like they were designed by tiny furniture experts.
If you’re renting, some models are portable. You can literally unplug it and take it to your next apartment. It’s the freedom of a beach vacation but for your water.