Solution:
The alum used for purifying water is known as potash alum. Potash alum is a combination of double sulphate of potash and aluminium. Potash alum is generally used in water purification, fireproof textiles etc.
The alum used for purifying water is
The alum used for purifying water is known as potash alum. Potash alum is a combination of double sulphate of potash and aluminium. Potash alum is generally used in water purification, fireproof textiles etc.