Waterdrop TSU 0.01 Micron Ultra Filtration at $139.99

What this under-sink filter is built to handle

Municipal tap water that tastes of chlorine is the job here. The Waterdrop TSU runs three stages and a 0.01 micron ultrafiltration membrane that reduces chlorine, PFAS, taste, odor and heavy metals, while leaving your water's natural minerals in place.

It handles that job without power or a drain line, because nothing is rejected as wastewater. At up to 1.05 GPM it fills a glass at a steady pace rather than a trickle.

We'd consider it for a household on city water that wants better-tasting drinking water without storing big bottles on the counter. The brushed nickel faucet that comes with the system gives you a dedicated tap for that water.

What this price means for your setup

At $139.99, you are saving $24.60 against the typical price over the last 90 days of $164.59. Those recurring filter costs are the real ownership question, so check the current prices for the PP, CT and UF cartridges before you commit to the system.

The UF stage is rated for 24 months, the CT stage for 12 months and the PP stage for 6 months. A four-light panel on the unit tells you when a change is due, which keeps the schedule visible.

One practical note: replacing cartridges is straightforward because the part numbers are published for this specific model.

Fitting it under a tight cabinet

The unit measures 4.68 inches wide, 13.97 inches high and 14.81 inches long, so measure the cabinet floor beside your disposal and any stored items. Leave room to reach the cartridges when they need swapping.

The system connects to standard 1/2 inch or 3/8 inch cold-water pipes, and the box includes what you need for the install. You will need to drill the countertop for the separate faucet.

Clearance under the sink and where the new faucet lands are the two things to confirm before ordering.

When to skip this filter

If your main goal is removing dissolved solids, this is the wrong unit because it does not reduce TDS. A reverse osmosis system fits that goal better.

Skip it too if you are on well water or want to filter hot water, since it is designed for cold municipal supplies. And if you would rather not drill your countertop, the separate faucet makes this a poor match.

For city water and a desire for better taste with minerals kept in, this is the setup we recommend. Before you buy, confirm your under-sink connections are 1/2 inch or 3/8 inch and that the drill spot works.

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