Dionela FTK3 undersink water filter

Two-stage filtration plus hard water treatment. Cleans impurities and makes great-tasting water.

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Product description

Dionela FTK3 undersink water filter

Dionela water filters are a quick and cost-effective solution for improving the quality of water in your household for drinking, preparing beverages, and cooking. This under-counter filter fits neatly out of site under the sink and attaches to a filtered-water faucet. These are purchased separately and are available in a simple form and more elegant form.

The filtration rate of 1.5 liters per minute offers a ready supply of filtered water for immediate use.

Dionela FTK3 cartridge

FTK3 filtration for hard water

The FTK3 has all the same capabilities as the FAM1 filter, plus it has a special insert for hard water treatment. It uses a two-stage system to effectively purify your water.  The first stage is a textile-based system which removes physical impurities including dirt, sand, rust, and metal pieces from pipes. The second stage uses bacteriostatically treated granular activated carbon to remove dissolved substances including chlorine, radon, heavy metals, organic substances, detergents, and pesticides. It also improves the taste, clarity, and color of water.

The hard water treatment drastically reduces mineral deposits, which is great for appliances like coffee makers, tea pots, and espresso machines. It's also good for people, as hard water can lead to kidney stones and skin problems.

Dionela under sink schematic

Simple hookup

To hook up the Dionela under sink filter, a three-way valve is screwed onto the cold water line. A tube runs to the filtered water tap (to turn on and off the water), a second tube to the filter input, and a third tube from the filter output to the tap for pouring

Dionela filter cartridge

Replaceable filter

The lifespan of hard water filters depends on the level of minerals in the water. In any case, the lifespan of the FTK3 is much lower than standard FAM1 filters. See the chart below for the approximate capacity before replaceing, depending on the nitrate level.e:

Carbonate level (mmol/l) / Filter capacity (liters)

1,5 | 2400
   3 | 1200
3,5 | 1000
   4 | 900
   5 | 720
   6 | 600

To save money, the filter can be sent in for replacement. The internal filtration elements are removed and replaced for a fraction of the cost of a new filter.


  • FTK3 filter cartridge
  • Stand for under sink mounting
  • Input for 1/4" tube
  • Outlet for 1/4" tube
  • All necessary tubing
  • Water hardness level test kit
  • NOTE: Valve adaptor to connect to cold-water line not included


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