What is Lime Water Used For?


Lime water, also known as calcium hydroxide solution or hydrated lime solution, is a versatile substance that finds various applications in different industries. This article aims to explore the multiple uses of lime water and delve into its significance in various fields.

1. Construction and Building Industry

The construction and building industry extensively utilizes lime water due to its remarkable properties. Here are some of its key applications:

1.1 Mortar and Plaster

Lime water is commonly used in the preparation of mortar and plaster. It acts as a binding agent, enhancing the strength and durability of the construction material. The addition of lime water to mortar and plaster mixtures improves workability and reduces cracking.

1.2 Soil Stabilization

In the construction of roads, lime water is often employed for soil stabilization. It helps in improving the load-bearing capacity of soil, making it suitable for building foundations and structures.

1.3 Whitewashing

Lime water plays a vital role in traditional whitewashing techniques. It is mixed with lime and applied to building surfaces to provide a protective and decorative coating. Whitewashing is commonly used for historical preservation and aesthetics.

2. Water Treatment and Purification

Lime water is widely utilized in water treatment and purification processes for the following purposes:

2.1 pH Adjustment

Due to its alkaline nature, lime water is used to adjust the pH levels of water. It helps neutralize acidity, making the water suitable for various applications, including drinking, irrigation, and industrial processes.

2.2 Coagulation

Lime water aids in the coagulation process, where impurities and suspended particles in water clump together and form larger particles. This facilitates their removal through sedimentation or filtration, leading to cleaner and clearer water.

2.3 Softening

Hard water, which contains high levels of dissolved minerals, can be treated with lime water for softening. Lime reacts with the minerals, such as calcium and magnesium, present in hard water, reducing their concentration and preventing scale formation in pipes and appliances.

3. Agriculture and Gardening

Lime water finds several applications in the agricultural and gardening sector. Here are a few significant uses:

3.1 Soil pH Adjustment

Agricultural practices often require adjusting the pH of soil to create optimal conditions for plant growth. Lime water is used to increase the pH of acidic soils, neutralizing their acidity and promoting nutrient availability.

3.2 Fungicide and Insecticide

Lime water can act as a natural fungicide and insecticide when applied to plants. It helps control fungal diseases, such as powdery mildew, and repels certain insects, safeguarding the health of crops and plants.

3.3 Composting

In composting processes, lime water is sometimes added to accelerate decomposition and neutralize odors. It helps maintain the pH balance in the compost, aiding in the breakdown of organic matter.

4. Industrial Applications

Lime water is widely used in various industries for different purposes. Let’s explore a few notable applications:

4.1 Manufacturing of Chemicals

Lime water serves as a crucial ingredient in the production of various chemicals, including calcium carbonate, sodium hydroxide, and bleach. Its alkaline properties and ability to react with other substances make it essential in chemical manufacturing processes.

4.2 Leather Tanning

In the leather industry, lime water is used during the tanning process. It helps remove hair and other impurities from animal hides, allowing for better preservation and preparation of leather.

4.3 Paper Production

Lime water plays a significant role in paper production. It is used in the pulping process to break down wood fibers and remove impurities. Lime water also helps control pH during the manufacturing of paper, ensuring optimal paper quality.

5. Health and Medicine

In the field of health and medicine, lime water finds some applications due to its antimicrobial and alkaline properties:

5.1 Antacid

Lime water can be used as an antacid to alleviate symptoms of acid reflux and indigestion. It helps neutralize excess stomach acid, providing relief from heartburn and discomfort.

5.2 Skin Treatments

Lime water is sometimes used in skincare products and treatments due to its antibacterial properties. It can help cleanse and disinfect the skin, reducing the occurrence of acne and other skin infections.

5.3 Traditional Medicine

In traditional medicine, lime water is believed to have various health benefits. It is used in herbal remedies and alternative therapies for conditions like sore throat, cough, and digestive issues.

6. Other Applications

Aside from the above-mentioned fields, lime water finds utility in several other areas:

6.1 Food Industry

In the food industry, lime water is used in processes like pickling and preserving. It helps maintain the texture and crispness of fruits and vegetables, preventing spoilage.

6.2 Art and Restoration

Lime water is often utilized in the restoration of artwork and historical monuments. Its gentle cleaning properties make it suitable for removing dirt and grime from delicate surfaces without causing damage.


  1. What is lime water made of?

    Lime water is made by dissolving calcium hydroxide (lime) in water.

  2. Is lime water safe to consume?

    Lime water is generally safe to consume in moderate amounts. However, excessive consumption can lead to alkalosis, a condition caused by high levels of alkalinity in the body.

  3. Can lime water be used for drinking?

    Lime water can be used for drinking after ensuring it is properly diluted and the pH is adjusted to a safe level.

  4. How long does lime water last?

    Lime water should be stored in a tightly sealed container and kept away from direct sunlight. When stored properly, it can last for several months.

  5. Can lime water be used for fish tanks?

    Lime water should not be used directly in fish tanks as it can significantly alter the pH levels and harm aquatic life. Proper water conditioners should be used instead.

  6. Is lime water flammable?

    No, lime water is not flammable.

  7. Can lime water be used as a natural cleaning agent?

    Yes, lime water can be used as a natural cleaning agent for certain surfaces. However, it should not be used on materials sensitive to alkaline substances.

  8. Is lime water effective against mold?

    Lime water can help combat mold growth due to its alkaline and antimicrobial properties. However, it may not be as effective as dedicated mold removal products.

  9. Can lime water be used in swimming pools?

    Lime water is not suitable for use in swimming pools. Chlorine and other pool chemicals are typically used for water treatment and maintenance.

  10. Can lime water be used to clean metal surfaces?

    Lime water should not be used on metal surfaces as it can cause corrosion or discoloration. Appropriate metal cleaners or polishes should be used instead.


Lime water is a versatile substance with numerous applications across various industries. From construction and water treatment to agriculture and healthcare, its alkaline and antimicrobial properties make it indispensable. Understanding the diverse uses of lime water highlights its significance and potential in different fields, contributing to sustainable development and improved quality of life.

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