Lime filter



Better flavor for coffee and tea. Less lime stains.

Reduce your water hardness with lime filters.



What does high water hardness mean for me?

Water that is too hard does not pose a health risk, but technically it does. Due to high water hardness, consumers may suffer high property damage. With hardness levels from hardness range 3 (from 15 °dH), it is only a matter of a short time before the first damage.


Some examples of this:

Calcification or clogging of pipe installations
Destruction of electrical appliances such as coffee machines, kettles, instantaneous water heaters or washing machines,
Water damage as a result of defective appliances and porous hoses,
- Difficult to remove Lime deposits  on ceramics in bathrooms and kitchens,
Poor washing results when washing dishes and glasses (mainly gastronomy),
- Increased risk of contamination due to increased internal surface area within pipes and hot water tanks. This particularly affects domestic installations made of galvanised steel pipes.


Can activated carbon filters also get out limescale?

Yes, the filters remove lime particles and all other particles from the water up to the specified filter fineness (e.g. 0.45 µm for the NFP Premium or 0.15 µm for the IFP Puro or the Superpure). The dissolved lime, i.e. the minerals, remain in the water. Lime is mainly composed of calcium and magnesium - these are minerals. By "dissolved" is meant here: dissolved like sugar in water. Carbonit® activated carbon filtered water does not prevent all deposits on electrical appliances, but it usually reduces them considerably and changes their consistency - the deposits are much softer. If the lime (i.e. calcium and magnesium) is also to be removed from the water, this is possible with an additional cation exchanger.
For small applications, e.g. with tea, we recommend the bellima tea filters, which we have on offer. 


Why doesn't the utility decalcify the water?

For the most part, water suppliers simply lack the financial resources for limescale treatment on these scales. Since the lime content of drinking water has no direct health relevance for the human organism, there is no acute need for action. The water supplier shifts the problem solution to the end customer. Many small decentralised limescale treatment plants, whose acquisition and operating costs are borne by the end customer, are the favoured solution here.


What is meant by hard and soft water?


Hardness range    Hardness in mmol/l Hardness in °dH Characterisation   
1 0-1.25 0 - 7 very soft to soft
2 1.25 - 2.5 7 - 14 soft to medium hard   
3 2.5 - 3.8 14 - 21 medium hard to hard


Water hardness is the sum of the alkaline earths - or also called alkaline earth ions - which consist predominantly of calcium and magnesium ions (to a lesser extent also strontium and barium ions). The sum of the alkaline earth ions is given in the international unit mmol/l (millimoles per litre) or mol/m3. The unit mmol/l can be converted into the formerly valid and still widely used unit °dH (degree of German hardness), as shown above:

~ 1 mmol/l = 5.6 °dH or 1 °dH = 0.178 mmol/l

Total hardness (GH), given in mmol/l, divided by the factor 5.6 or multiplied by the factor 0.178, gives the water hardness in degrees of German hardness (°dH).

In terms of quantity, 1 °dH corresponds to 10 mg CaO (calcium oxide) per 1,000 ml water and 1 mmol/l corresponds to 100 mg CaCO3 (calcium carbonate) per 1,000 ml water.
From a chemical point of view, hard water means nothing more than the dissolution of carbonates in acid. Here, the largest part is present as HCO3-, H2CO3 and as dissolved CO2, and only a little as CO32-. Depending on the acidity of the water (measured by pH) and the temperature, a state of equilibrium settles down, which defines the saturation of the water (solubility product). 



Lime is ubiquitous

But unfortunately, this white rock is not only found in mountain ranges, coral reefs and stalactite caves. Limestone makes for hard water in 75% of German households. And although limestone is harmless to health, it unfortunately reduces the taste of drinking water. And not only in terms of taste, the consistency of the water also suffers when there is too much calcium carbonate. You can recognise the residues immediately as white flakes in the kettle and as surface skin on tea and coffee.

Regions where the tap water contains a lot of limestone have very hard water, which is particularly noticeable in the kitchen, but also in the bathroom. We know the phenomenon from showering, when after washing the structure of the hair is affected by the hardness of the water. How much lime is contained in the tap water can be identified with a water hardness test, which we at sanquell enclose with the order.


What is the function of lime in nature?

The most important property of lime in nature is to prevent acidification of the soil. Vital soil organisms avoid soil that is too acidic, and lime ensures that the soil is loose, crumbly and rich in nutrients. Lime in the soil creates the perfect conditions for growing food. But it is a less suitable ingredient for domestic drinking water, as the lime content makes the water hard and less drinkable.

Hard water is ultimately drinking water with high levels of calcium and magnesium. Both are components that humans need to live. However, these substances are not required in such high quantities that one would have to put up with limescale fringes and an unpleasant taste.


How do I remove limescale from my drinking water?

With the limescale compact filter from sanquell, the aroma and appearance of hot drinks are improved. Limescale deposits in the beverage and household appliances are remedied. The filter works with a so-called ion exchange principle: Calcium ions are exchanged for sodium ions within the filter cassette. This makes the tap water noticeably softer and immediately more aromatic.


What are the benefits of a limescale filter for my household?

Household appliances do not like limescale. In the long run, calcified machines consume more energy, become less efficient and are unappetising. Of course, you can decalcify your kettle regularly with vinegar, but it would be more convenient not to find limescale residues in the appliance in the first place, right?

In addition to the ion exchanger, the sanquell limescale compact filter contains a downstream activated carbon block (10µm), which additionally removes dissolved pollutants, odour and taste impairments as well as particles up to 10µm in size. The silver coating of the activated carbon ensures hygienic safety.


A limescale filter for plant lovers

This filter is also popular with plant lovers who like to create a tropical atmosphere in their urban jungle of a flat using spray bottles or electric humidifiers. Thanks to the reliable limescale filter, watering water is naturally also freed from limescale residues, which can no longer settle as white streaks on the leaves.