Choosing water filtration often comes down to a practical trade-off: do you want filtered water at a dedicated faucet without a power connection or wasted water, and are you prepared to add that faucet at the counter? The Waterdrop Refurbished TSU 0.01μm Ultra-Filtration Under Sink Water Filter System is aimed squarely at that decision.
Quick verdict
At USD 99.99, the Waterdrop TSU is a focused choice for a home using municipal cold tap water that wants an under-sink ultrafiltration setup. Its 0.01μm ultrafiltration membrane is described as reducing chlorine, PFAS, taste, odor, and heavy metals while retaining essential minerals. The key boundary is equally clear: it will not reduce TDS, and installation requires countertop drilling for the included separate faucet.
Who it suits
Choose the Waterdrop TSU if your priority is a dedicated filtered-water tap for municipal water and you prefer a system that does not need a power source. The listed 19-inch depth and 19.2-inch width also make cabinet space worth considering before committing to the format.
It is less suitable for a well-water setup, a hot-water line, or a household specifically seeking TDS reduction. Those are not minor details: the system is designed for cold municipal tap water, and its filtration approach is explicitly not intended to lower TDS.
What stands out
The central appeal is the ultrafiltration approach. Waterdrop describes the 0.01μm membrane as addressing a broad group of water concerns, including chlorine, PFAS, taste, odor, and heavy metals, while keeping essential minerals in the water. For shoppers who dislike the taste or smell of their tap water but do not want a system that requires electricity, that combination gives the TSU a clear role.
The system is also described as producing no wasted water and no pressure drop. Along with the separate faucet included in the package, that makes the setup oriented toward a distinct drinking-water outlet rather than changing the flow from the main kitchen faucet.
Meaningful trade-offs
The installation requirement should guide the decision. A separate faucet is included, but countertop drilling is required for it. That makes the Waterdrop TSU a better fit for shoppers comfortable with a dedicated-faucet arrangement than for someone seeking a no-drill solution.
TDS is the other important trade-off. The TSU can address the substances and taste-related concerns named above, yet it will not reduce TDS. Shoppers whose main goal is lowering TDS should not choose this model for that purpose.
Waterdrop Refurbished TSU 0.01μm Ultra-Filtration Under Sink Water Filter System
The reason to choose this Waterdrop system is specific: for USD 99.99, it combines 0.01μm ultrafiltration, a separate included faucet, cold-water municipal compatibility, and operation without a power source. Its refurbished condition may also be relevant to shoppers comfortable selecting a refurbished under-sink system. The deciding limitation is that it requires countertop drilling and does not reduce TDS.
Bottom line
The Waterdrop TSU makes sense when municipal cold tap water, a dedicated filtered-water faucet, and ultrafiltration are the priorities. Pass on it if drilling, well water, hot-water use, or TDS reduction is central to your plan.
