Leaks are always a risk, but countertop filters can be just as messy if someone bumps them or forgets to tighten things up after swapping filters.
Had a countertop filter once—looked tidy at first, but my kids kept knocking the faucet diverter loose. Water everywhere. Switched to an under-sink no-drill kit last year. Install was actually smoother than I expected, and it’s been out of sight, out of mind since. Only hassle was cramming myself under the sink for 20 minutes, but I’ll take that over daily drips on the counter.
Honestly, I get the appeal of under-sink kits, but I’ve seen a few go sideways—especially if the fittings aren’t tightened just right or if you’ve got older plumbing. Countertop filters might be messier on the surface, but at least leaks are obvious and easy to catch before they cause real damage. Under-sink leaks can go unnoticed for ages and lead to warped cabinets or worse. If you go that route, double-check every connection and maybe even put a drip tray underneath, just in case.
Honestly, I’ve had both types and I’ll say countertop filters are way less nerve-wracking to install. No crawling under the sink, no worrying about old pipes or weird fittings. Yeah, they’re not the prettiest, but if something goes wrong, you spot it right away. Under-sink ones look cleaner, but I’ve had a slow leak ruin a cabinet before—didn’t notice until it started smelling musty. If you’re renting or on a tight budget, countertop’s probably the safer bet.
