Waterdrop TST-UF Ultra Filtration Under Sink Water Filter
- Capacity: 8000 Gallons
- Purification: Ultra Filtration
- Install Type: Under-Sink
- Material: NSF/ANSI Approved Components
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A high-capacity under-sink option for households that want to leave taps as they are while retaining minerals, at the cost of the deeper filtration reverse osmosis provides.
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ASIN: B0962M2QZMCategory: Water Filtration Systems
Overview
Where the WD-RT34T-WMA above relies on reverse osmosis, Waterdrop's WD-TST switches to ultra filtration, rated for roughly 8,000 gallons and built for under-sink installation.
Ultra filtration uses a finer membrane than carbon alone but doesn't strip dissolved minerals the way RO does, so it retains more of the water's natural mineral content while still filtering out finer particulates. The listing notes NSF/ANSI approved components, a certification detail worth checking against your own water report.
- Ultra filtration purification
- About 8,000 gallons rated capacity
- NSF/ANSI approved components
- Under-sink install, 13 lb
Who it's for
Fits households that want an under-sink system without RO's typical drain line and wastewater, and who don't mind the tradeoff of leaving dissolved minerals in the water. Not for anyone specifically seeking RO-level dissolved solids reduction.
Pros and cons
- 8,000-gallon rated capacity cuts change frequency well below pitcher filters
- NSF/ANSI approved components
- Under-sink install keeps the counter clear
- At 13 lb it needs dedicated under-sink space and a plumbing connection, unlike a portable pitcher
- Ultra filtration doesn't reduce dissolved solids the way reverse osmosis does
Performance notes
Ultra filtration screens out fine particulates and some contaminants through a membrane, without the dissolved-solids reduction reverse osmosis systems achieve. The 8,000 gallon rated capacity is well beyond a typical pitcher filter's lifespan, meaning far fewer cartridge changes.
Specifications
| Brand | Waterdrop |
|---|---|
| Dimensions & fit | |
| Weight | 13 poundslower than 50% of 41 water filtration systems |
| Dimensions | 13 × 4.9 × 14.5 inches |
| Dimensions | 12.99 x 4.92 x 14.49 in |
| Capacity & performance | |
| Capacity | 8000 Gallons |
| Construction & materials | |
| Material | NSF/ANSI Approved Components |
| Compatibility & installation | |
| Install Type | Under-Sink |
| Other details | |
| Purification | Ultra Filtration |
Closest rivals on specs
Apec Water RO-CTOP-C Water Filtration System- Weight 13 vs 10 pounds (+30%)
Frequently asked questions
Is this a reverse osmosis system?
No, the WD-TST uses ultra filtration rather than reverse osmosis, per the listed purification method.
How long does the filter last before replacement?
It's rated for about 8,000 gallons, well beyond a typical pitcher filter's interval.
Where does it install?
It's built for under-sink installation and weighs about 13 pounds.