Alum (Aluminium Sulphate) is a non-toxic solid compound commonly used in water treatment plants to clarify drinking water. Its use in lakes began in the early 1970s and is used to reduce the amount of phosphorus in the water. Lower amounts of phosphorus lead to lower algae and the symptoms associated with poor water quality. Alum is often used to control phosphorus release from the lake bottom sediments (internal loading). Even when phosphorus levels are reduced from external sources in the surrounding watershed, the internal cycling of nutrients within the system can continue to fuel significant algal blooms. With anti-inflammatory and antioxidant properties, Alum offers many benefits, including healing burnt wounds and curing eczema, chronic diarrhoea, and bloody stool. This article will explore alum, its benefits, dosage and precaution tips.
Last updated on : 29 Jul, 2025
Read time : 11 mins
Alum is an inorganic chemical compound generally made up of water molecules, aluminium or other metals, and sulphates. Alum is a hydrated double sulphate salt of trivalent metal (aluminium) and a monovalent cation (sodium, potassium or ammonium). The general chemical formula for alum is KAl(SO₄)₂·12H₂O. Alum crystals are also available in offline and online markets, such as grocery shops, medical stores, or e-commerce websites. These chemical compounds are generally sold as white fitkari in English, known as alum, red fitkari, or white alum and red alum stones.
Feature | Details |
What is Alum? | Alum is a chemical compound often used in water purification, medicines, cosmetics, and as a pickling agent. |
Origin | Alum occurs naturally in minerals such as alunite and bauxite and can be found worldwide. It has been used for centuries in various industries. |
Common Use | Alum is commonly used for water purification, as an astringent, in medicines, deodorants, and pickling foods. |
Chemical Composition | Alum refers to a group of double sulphate salts containing aluminium, most commonly Potassium Alum (KAl(SO₄)₂·12H₂O). |
Alternative Names | Potassium Alum, Potash Alum, Phitkari (in Hindi) |
Health Benefits | It acts as an astringent and is used in diarrhoea, dysentery, menorrhagia, etc. It prevents body odour, promotes wound healing, and has antibacterial properties. |
Forms Available | Powder, Crystal, Block, Liquid |
Recommended Dosage | Topical application is typically recommended for skin use. When used in water purification, 1-2 grams per litre of water is standard. Always follow product guidelines. |
Precautions | It should not be ingested in large quantities. Avoid direct contact with open wounds. Pregnant or breastfeeding women should consult a doctor before use. |
Side Effects | It can cause skin irritation or dryness. Ingesting large amounts can be toxic. |
Interactions | No significant interactions are known, but excessive use should be avoided on sensitive skin. |
Storage | Store in a cool, dry place away from moisture. Keep tightly sealed when not in use. |
In medical journals, alum is often referred to by several alternative names, including:
Alum is known by various local names in different languages and regions. For example:
Here’s the chemical composition of Alum in a tabular format:
Component | Description |
Potassium Sulphate (K₂SO₄) | It provides the potassium ion, essential for alum’s crystalline structure, and helps in coagulation processes. |
Aluminium Sulphate (Al₂(SO₄)₃) | Supplies the aluminium ion, responsible for alum’s astringent and antibacterial properties and water purification. |
Alum Formula: KAl(SO₄)₂·12H₂O
This highlights the roles of potassium sulphate and aluminium sulphate in alum.
The following pointers highlight the health benefits of alum:
Regular use of Alum can promote better oral hygiene and alleviate discomfort from oral issues. Simply applying a small amount of alum powder directly to the sore for mouth ulcers helps lessen the pain and aids in its recovery.
Fitkari benefits include treating an athlete's foot and a cracked heel using an alum foot soak. Soak your feet to soften the hard skin on your feet and fungal infections by dissolving alum in warm water. Incorporating neem leaves in the soak will enhance the fungi-killing activity.
Alum has been applied as an aftershave treatment for years due to its antibacterial and astringent nature; it aids in the treatment of minor injuries such as cuts and stops bleeding while at the same time tightening the skin. Avoid using alum stones that are used in barber shops to prevent infections.
Alum is widely used to clarify water by coagulating the dispersed material within the water and making the water transparent. Adding alum powder to muddy water helps settle the impurities, leaving clean water on top.
Alum is well-known as a natural deodorant because of its antimicrobial features. Unlike chemical-based antiperspirants, it fights against the bacteria responsible for body odour while not clogging the sweat glands, making it healthier.
Alum benefits include its use for hair removal when mixed with rose water, effectively slowing down hair growth over time. Additionally, it has skin-tightening properties. It can help reduce wrinkles. It also works well in face packs for acne when combined with turmeric or Multani mitti.
An alum sitz bath helps reduce inflammation, stop bleeding, and provide relief from haemorrhoids. Mixing alum in warm water and soaking for 20-30 minutes will help shrink haemorrhoids and minimise irritation
Alum is a versatile compound and is effective in the following ways:
Alum is an agent used in water treatment processes, especially in flocculation. It assists in the clotting of foreign particles that, in this case, it hampers the water flow to facilitate the removal of these particles, hence providing clean and safe water.
In skincare, alum is appreciated for the astringent effect which it produces. It helps in skin reformation, shrinks pores, and reduces acne scars for skin renewal. It also has antiseptic properties, which can be used to manage minor injuries such as cuts and scratches.
Alum is a popular ingredient in natural deodorants because it inhibits bacterial growth, which is responsible for body odour. It is most commonly used as a crystal and directly on the skin.
The following measures should be taken when using alum (aluminium sulphate) for medical purposes:
Alum, a chemical compound known as potassium aluminium sulphate, has several uses in health and hygienic aspects. Following are some recommended uses of alum:
Steps to use:
Steps to use:
Steps to use:
Steps to use:
Steps to use:
For any application, the recommended dosage of alum can differ. Here are some general guidelines:
Important Considerations:
Alum, specifically potassium alum may be incompatible with some drugs; it may hence change the said drugs’ action or enhance the side effects of the drug. As with all treatments, alum should never be self-administered without seeking advice from a health care worker.
Recommendations: One should not assume that alum does not have side effects or possesses any potential for interaction with other drugs; therefore, anyone intending to use alum should do so under the prescription of a qualified doctor. Supervision and a possible dose of champagne may be required to prevent side effects.
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