Is Calcareous Water Harmful? Effects on Health, Skin and Household Appliances

Do you encounter a slightly cloudy appearance when you fill the water flowing from your tap into a glass? Or does that stubborn white layer that forms at the bottom of your teapot in a short time bother you? This situation, which we call "chalky water" in our daily life, is actually a natural phenomenon related to the degree of hardness of the water. Many people worry when they see this white deposit and immediately think of this critical question: Is lime water harmful? The answer to this question involves much more than a single "yes" or "no". While the effects of lime water on the body when drunk are one thing, the effects on our skin, hair and expensive appliances in our homes tell a different story. In this guide, we will leave urban legends aside and examine all the effects and solutions of lime water in the light of scientific data.

What is calcareous water (hard water) and how to recognise it?

Water, popularly known as "calcareous water", is defined as "hard water" in scientific literature. Rainwater is soft and acidic by nature when it descends to the earth. However, as it percolates into the soil and mixes with underground sources, it incorporates the minerals in the layers it passes through. Water dissolves high amounts of Calcium (Ca) and Magnesium (Mg) ions as it passes through limestone and chalk deposits. The concentration of these dissolved minerals in water determines how "calcareous" or "hard" that water is.

You don't need laboratory tests to find out if your water is calcareous; small clues in your home will tell you the truth.

The Soap Test If the soap does not lather and remains dull when washing your hands, your water is hard. Calcium combines with the fatty acids in the soap to coagulate and prevent foaming.

Sediment and Stains: White rings left by drying water droplets in the shower cubicle, petrified deposits accumulated on tap heads and the dull appearance of your glasses even after washing are the clearest evidence that your water contains high minerals.

Hardness Degree of Water and Turkey's Water Structure

Turkey, in terms of its geological structure, has a young land formation and rich mineral deposits. This geographical feature causes our groundwater and therefore our mains water to be generally in the "hard" or "very hard" category. Especially in Antalya, Istanbul and many provinces in the Central Anatolia region, water hardness levels are high.

One of the most important parameters determining the quality of water is the amount of dissolved solids in water. The ideal level of this value is critical for the drinkability and flavour of the water. If you want to have more technical information on the subject, it is useful to take a look at what is Tds value and how to measure it.

The table below will guide you to understand the degrees of hardness of the water:

Is Drinking Calcareous Water Harmful?

It is a common misconception that calcareous water is directly poisonous or causes illness as soon as it is drunk. The World Health Organisation (WHO) states that hardness in drinking water has no proven negative effects on human health. In fact, calcium and magnesium are essential minerals for the human body. We need these minerals for bone development, regulation of heart rhythm and muscle function.

However, "not harmful" does not necessarily mean "trouble-free". Although the answer to the question of whether you can drink lime water is "yes", the flavour of this water is often described as metallic or chalky and it is difficult to drink. As the hardness of the water increases, the feeling of dryness in the throat and difficulty swallowing can prevent people from consuming enough water.

Calcareous Water and Kidney Stone Relationship

One of the biggest fears is the belief that calcareous water causes kidney stones. Although the logic of "if I drink the water, the lime in it will accumulate in my kidney and turn into stones" sounds plausible, the medical facts are more complex. Scientific studies have not found a direct and strong correlation between water hardness and kidney stone formation.

On the contrary, the main cause of kidney stone formation is genetic predisposition and insufficient fluid intake. Condensation of urine prepares the ground for crystallisation of minerals. Therefore, focusing on the answer to the question of how much water we should drink per day rather than the hardness of the water and consuming plenty of water is the most effective way to protect kidney health. Some studies even suggest that dietary calcium (including water) binds oxalate in the intestines and reduces its absorption, which may reduce the risk of kidney stones.

Effect of Calcareous Water on Digestive System

Although it is accepted that calcareous water does not pose a serious health risk, it can cause some digestive problems in sensitive bodies. In particular, people who change the region they live in and suddenly start consuming very hard water may experience temporary diarrhoea or bloating as the intestinal flora adjusts to this new mineral density. In addition, the bitterness and heaviness in the taste of the water may cause a feeling of nausea in people with a sensitive stomach. This should not lead to doubts about the quality of the water and should not lead to a reduction in water consumption.

External Effects of Calcareous Water on the Body: Skin and Hair Health

Much more tangible and disturbing than drinking lime water is the damage caused by its external use, i.e. during bathing and cleaning. If you ask a dermatologist the question "is lime water harmful?", the answer is likely to be "yes, it can be harmful to your skin and hair".

Risk of Skin Dryness, Itching and Eczema

When you wash with hard water, the calcium and magnesium ions in the water enter into a chemical reaction with the soap and shampoo. As a result of this reaction, a water-insoluble, sticky layer (soap salt) is formed. This layer is not completely removed from your skin even if you rinse.

• Clogged Pores: This invisible residue remaining on the skin surface clogs the pores. It disrupts the skin's natural oil balance (sebum) and prevents it from breathing.
• Dryness and Irritation: When the skin's natural moisture barrier is damaged, the skin becomes dry, flaky and itchy.
• Eczema in Babies: Chalky water is a major threat, especially to the delicate skin of babies. A study by King's College London revealed that the risk of developing eczema (atopic dermatitis) in babies exposed to high hardness water in the first three months of their lives increased by up to 87%. Chalky water disrupts the pH balance of the skin, making it vulnerable to pathogens.

Is Calcareous Water Harmful to Hair?

If you think your hair is dull, dull and hard no matter how much care you take, the culprit may not be your shampoo, but your tap water. Unfortunately, the answer to the question of whether calcareous water is harmful to hair is yes.

The minerals in hard water accumulate on the hair strands and cause the hair cuticles to swell, just like the arrangement of tiles.

• Dulling: Mineral build-up prevents the hair from reflecting light, hair appears lifeless and dull.
• Stiffening and breakage: Hair strands lose elasticity, have a "straw-like" texture and break easily when combing.
• Hair Loss: Clogging of the pores in the scalp and weakening of the hair follicles can trigger the problem of hair loss in the long term.
• Coloured Hair: Lime bleaches the colour of the hair dye faster and causes the colour to become dull.

Hidden Danger for Home Appliances and Your Budget

The effects of calcareous water are not limited to your body; it also makes a serious hole in your home economy. All water-powered household appliances (washing machine, dishwasher, boiler, kettle, iron) are under threat from limescale. This is called "hidden danger" because the damage is often not recognised until the appliance breaks down.

Energy Loss in Heating Systems

Lime is an excellent insulating material. Limescale deposited on the heating elements prevents the heat from being transferred to the water. This causes the appliance to consume much more energy to heat the water and to run longer.

According to the Water Quality Association (WQA), the formation of a limescale layer only 1.6 mm thick on heating surfaces reduces energy efficiency by 12 per cent. As the lime layer thickens, this loss reaches 25% and more. In other words, a significant portion of the electricity bill you pay every month is actually spent to heat the limestone in between, not the water.

Laundry, Dishwashing and Clothes Life

Calcareous water reduces the performance of cleaning materials.

• Detergent Consumption: In hard water, detergents do not foam and lose their cleaning power. According to Battelle Memorial Institute study, you need to use 50% more detergent and soap than soft water to provide the same hygiene in calcareous water.
• Fraying of Clothes: Lime crystals rub against fabric fibres during washing, abrading them. Purdue University research shows that the life of cotton fabrics washed in hard water is shortened by 15% to 40%. This is the main reason why your white clothes turn grey over time and your towels become stiff.
• Dishes: Scratches and foggy appearance on glasses coming out of the dishwasher are the result of limescale corroding the glass surfaces.

Chalky water in the kitchen: Tea and Dishes

The most important factor determining the taste of tea, which is indispensable for Turkish culture, is water. Can you drink tea with chalky water? Yes, you can, but the pleasure you will get will definitely not be the same. Calcareous water reacts with phenolic compounds in tea leaves.

Image: The colour of the tea changes from a clear, rabbit's blood red to a cloudy, dark brown. A thin, oily-looking film forms on the surface of the tea cup. This layer is actually a combination of lime and tea oils.

Flavour: Lime masks the flavour of water and tea. The flavour of the tea becomes bitter and the distinctive soft flavour is lost.

The same applies to cooking. Using calcareous water when boiling pulses prolongs the cooking time and can cause the pulses to remain hard inside. Vegetables lose their vibrant colour. The main reason why professional chefs and restaurants use purified water in their kitchens is to maintain the standard of flavour.

Lime Removal Methods and Solution Suggestions

So, how can we get rid of this problem that affects both our health and our pocket? There are various options from temporary methods that you can apply at home to technological systems that offer a definitive solution.

Does Boiling Water Remove Limescale?

One of the most frequently asked questions is "does boiled water scale?". Boiling water only precipitates bicarbonates, which are called "temporary hardness", and allows them to sink to the bottom (this is the sediment at the bottom of the kettle). However, the sulphate and chloride compounds that make up the "permanent hardness" of water are not destroyed by boiling.

More importantly, when you boil water, the water evaporates but the minerals do not evaporate. This can lead to an increase in the concentration (density) of minerals in the remaining water. So boiling does not completely remove limescale and is not a practical or fully effective method of softening water.

Water Treatment Devices and Filter Systems

The most effective and scientific way to solve the limescale problem radically is to physically purify the water from minerals and lime-forming elements. This is where advanced filtration technologies come into play. A water purifier with Reverse Osmosis technology retains up to 99% of lime, heavy metals and other contaminants by passing water molecules through a semi-permeable membrane.

Treatment systems can be installed not only for drinking water but also for the water line of the whole house. These devices, known as "Water Softening Systems", completely prevent limescale by removing calcium and magnesium from the water by ion exchange method and replacing them with sodium ions. In this way, both your drinking water is flavoured and your home appliances and skin are protected from the damages of lime. To have periodic maintenance for the efficient operation of your device and water purification filter replacement is vital for the sustainability of water quality.

If a whole-house system is beyond your budget, you can at least protect your hair and skin health by using anti-scale filters attached to shower heads, and restore the flavour of your tea and meals with an under-counter purifier in your kitchen.

Frequently Asked Questions

We have compiled the most curious questions and short answers about calcareous water below:

What happens if you drink lime water?

According to the World Health Organisation, there is no direct proven harm from drinking chalky water. However, the water can taste bitter, is heavy to drink and may cause temporary bloating in sensitive stomachs.

Is it harmful to shower with lime water?

Yes, it damages the skin and hair. It makes it difficult to remove soap residues from the skin and clogs the pores. This increases the risk of dryness, itching, eczema and causes hair to become dull and fall out.

Does lime dissolve in boiled water?

No, it doesn't. Boiling only precipitates the temporary hardness as sediment. The permanent hardness persists and the mineral concentration in the remaining water may increase as the water evaporates.

Does calcareous water cause kidney stones?

Scientifically, there is no conclusive evidence that calcareous water directly causes kidney stones. Genetic factors and drinking less water are more effective in kidney stone formation.

How to remove limescale from the kettle?

Natural methods are best. Put some vinegar or lemon salt in the kettle, add water and boil. You will see that the lime dissolves quickly. It is safer for health to use this method instead of chemical solvents.

Is the purified water too soft, does it destroy minerals?

Reverse osmosis devices remove minerals to a large extent. However, in quality devices, calcium and magnesium are restored to the purified water in a controlled manner with a "mineral filter" or "alkaline filter" at the last stage. Thus, a healthy water that is both lime-free and mineral balanced is obtained.