Multi-stage under-sink water filter

The space-saving and food-safe water filters are easily connected to the water supply under your sink using the included installation kit. The filters are particularly convenient to use with our 3-way faucet , which allows you to choose between filtered water and regular water.

The long shape of the filter elements allows the water to flow through a particularly large amount of activated carbon, resulting in extremely good filtration results and extending the filter element's lifespan to a maximum of six months. This is also confirmed by extensive, independent laboratory tests. Feel free to ask us about the laboratory certificates.

Filter properties at a glance:

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The multi-stage under-sink water filter is available in two versions:

The Duo Filter

1. Stage: Optional limescale or nitrate filter. For effective filtration of nitrate or limescale in your drinking water.
2. Stage: Activated carbon/ceramic filter (Ultracarb). Removes bacteria, heavy metals, pollutants such as pesticides, microplastics, and pharmaceutical residues from tap water.

The Trio Filter

1. Stage: Limescale filter. For effective filtration of limescale in your drinking water.
2. Stage: Nitrate filter. For effective filtration of nitrate in your drinking water.
3. Stage: Activated carbon/ceramic filter (Ultracarb). Removes bacteria, heavy metals, and pollutants such as pesticides, microplastics, and pharmaceutical residues from tap water.

Doulton under-sink filters guarantee pure, delicious drinking water. Unlike bottled water, they are free from plasticizers like BPA found in plastic bottles.

The filter housing is durable and easy to clean. The Ultracarb filter cartridge has a ceramic outer shell that reliably traps bacteria and dirt. It's even easy to clean with a brush under cold running water. The filter core consists of compressed activated carbon, which traps drug residues and odor- and taste-altering substances. Furthermore, the inner activated carbon core is coated with heavy metal-binding earths that trap lead, among other substances.
The limescale filter element is filled with a special resin that binds limescale.

The filter comes with a practical connection set, optionally for:

- the connection to the cold water supply and to our 3-way tap
- connection to the cold water supply and to a standard tap

To connect to a faucet not included in our range, you may need a small adapter that can be attached to the screw thread of your faucet. Feel free to ask us if you need further information.
Please note: We recommend using the water filter with a 3-way faucet. If you use the filter with a regular faucet, the cold water flow to your faucet will be reduced, which can make washing dishes, for example, a bit more difficult. This often requires a higher water flow.

The Ultracarb ceramic activated carbon filter element should be replaced every 3 - 6 months.
Likewise, the limescale and nitrate filter elements should be replaced approximately every three months. The replacement interval may vary depending on water quality.
You can find the filter elements here:

Scope of delivery Duo: Duo filter housing, optional nitrate or lime filter element, Ultracarb filter element, connection set

Scope of delivery Trio: Trio filter housing, nitrate and lime filter element, Ultracarb filter element, connection set

Dimensions (without connecting parts such as hoses): select the corresponding model (2 / 3 stages) to see the dimensions.

Flow rate / filter capacity: 2 - 4 liters per minute

Required line pressure: at least 1.4 bar