# Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter

Slightly: The Waterdrop WD-TSB-ALK is an under-sink alkaline water filter system with a dedicated faucet. It is described for cold municipal tap water and does not reduce TDS, so it is not a choice for buyers seeking TDS reduction or well-water filtration.

- [Original product page](https://best-deals.pro/product/waterdrop-wd-tsb-alk-under-sink-alkaline-water-filter)
- [View offer](https://best-deals.pro/visit/waterdrop-wd-tsb-alk-under-sink-alkaline-water-filter)
- Market: US
- Language: en-US
- Currency: USD
- Brand: Waterdrop
- Model: WD-TSB-ALK
- Category: Home & Kitchen > Kitchen Appliances > Water Purifiers
- Price: 117.88 USD
- Previous price: 149.99 USD
- Discount: 21%
- Price checked: 2026-11-14T07:05:43.324Z
- Rating: 4.5 / 5
- Reviews: 785

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Listing describes an alkaline system with three under-counter filters and a dedicated faucet.
- The manufacturer says the filters reduce PFAS, PFOA/PFOS, fluoride, residual chlorine, heavy metals, taste and odor.
- Listed for cold municipal tap water. The manufacturer says it does not reduce TDS and is not suitable for well water or hot water.
- Replacement filters are identified as WD-10PP, WD-10GC and WD-10ALK, with the WD-10ALK specified for the alkaline stage.

## Pros

- Dedicated faucet is listed, keeping filtered-water dispensing separate from the main sink faucet.
- The listed 8,000-gallon capacity and 12-month filter life provide capacity and time-based replacement guidance.

## Cons

- Does not reduce TDS, limiting its suitability for buyers who specifically want dissolved-solids reduction.

## Specifications

### Identity
- Brand: Waterdrop
- Model: WD-TSB-ALK
### Power and operation
- Power configuration: Mechanical Water Pressure
- Maximum flow rate: 1.5 gpm
- Supported water TDS level maximum: 700
### Dimensions and installation
- Installation type: Under Sink
- Dimensions listed: 12.9"L x 4.3"W x 12.4"H
### Materials and protection
- Material listed: NSF/ANSI Approved Components
### Filtration and maintenance
- Purification method: Alkaline
- Capacity: 8000 gallons
- Filter life cycle: 12 months
### Water conditions
- Lower temperature range: 35 °F
- Upper temperature rating: 100 °F

## Before you buy

- The manufacturer specifies cold municipal tap water only, not well water or hot water. It also states that TDS is not reduced, and that listed TDS maximum is 700. Confirm replacement-filter compatibility and change intervals for your water and usage.

## In the box

- System ×1 (Included)
- Faucet ×1 (Included)
- 3/8"–1/2" converter set ×1 (Included)
- Accessory kit ×1 (Included)
- Hose ×2 (Included)

## A good fit for

- Households with municipal cold tap water seeking a separate faucet and alkaline filtration.
- Buyers who want a listed filter capacity and annual filter-life reference.

## Less suited to

- People using well water or seeking filtration for hot water.
- Buyers whose primary goal is lowering TDS.

## Customer feedback

Aggregate customer ratings skew strongly positive, with most ratings in the five-star category, but a smaller low-star share means the figures alone do not explain individual experiences or establish why customers felt as they did. They offer a broad sentiment signal, not evidence about filtration performance or fit for a particular water source. The manufacturer's stated limits remain important, especially the lack of TDS reduction and restriction to cold municipal tap water.

## Frequently asked questions

### Does the WD-TSB-ALK reduce TDS?
No. The manufacturer explicitly says this system does not reduce TDS.
### Can it be used with well water or hot water?
The listing says it is designed for municipal tap water and cold water sources, and is not suitable for well water or hot water.
### Which replacement filters are specified?
The listing names WD-10PP, WD-10GC and WD-10ALK as the replacement filters for the system.
### What does the listing say about capacity and filter life?
It lists a capacity of 8,000 gallons and a filter life cycle of 12 months. These are manufacturer claims, not independently verified.

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## Images

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 1](https://best-deals.pro/i/ogYh3hXHxCLV_RB6qAnu5HClNfnVlHJMm2rUF5Aoqo8IBccdASLk9gTW6mnHCyf0UtTRqgV7vY5XEIl-_5vLj24hAbjsLwGtOJ4HBpaLeLB8Fqtmx31W.jpg)

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 2](https://best-deals.pro/i/HQOPb9PYCalEtHzpHEGY4GJhXCS-E0bnOixjBVlNMPcfO8AjmYUfDCxTMyjektGCXKfIFLRim8S4zkFKrWSH1TkiXZr4mRvjzxm-8cwVkVWVzMv42XZC.jpg)

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 3](https://best-deals.pro/i/NkXO6hzBWWqvqn6NxNZyEHUi54wKEDkfdmgVJlTRPCIJobc8JCLzjTpwqpOKgOXZ5Kv_LIBKd7m7n0e022M5ZNnAtkrEtLYYJQa-9TWQSHs-HF8roXZT.jpg)

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 4](https://best-deals.pro/i/4CMCUz3-dHjiofZFVxMpqI2EEsSdSQ2SITWurx0iWbcJZARhjGMtXa7JIqWZudfTXIGZMKoodBHL4ARTRR__Df6LI8hThcgrotS9yTVLxTOGiINhc-BT.jpg)

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 5](https://best-deals.pro/i/-DrVEIjmwpza0bXwTQnZooE9wKIzUOfUiBijGPuim7JJ8DEWT5CIwXjfCfLk5maz9LjUMh6UUIBl0ICj3_FRQ-YH3aubZdXh1dr3tZdCz8tmnMu-7moc.jpg)

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 6](https://best-deals.pro/i/-sROEiQK6lDfDjqRZ9XArWrJ1RDHyOBcYQINtc724G5ZJ68r_kOqqJmqwdMphzhqFJc53zVebVLIDvCHBdbqFe3vdF8mOLkDp0dwvnooiA.jpg)

![Waterdrop WD-TSB-ALK Slightly Alkaline Under-Sink Water Filter — 7](https://best-deals.pro/i/xmPoC1G4anYlRdM2BQTsCUZM-5bQ4_5lnUU-lPAA9QprCo--VVIwQCT0C8YvZKbkZAY2MxBf5WeLKlPAEUKDMmJDiwup5y-BQHDf3DtoypMglct6Ev5n.jpg)